Title of Invention

4-PYRIDYL-AND 2,4-PYRIMIDINYL-SUBSTITUTED PYRROLE DERIVATIVES AND THEIR USE IN PHARMACY

Abstract

The present invention relates to 4-pyridyl- und 2,4- pyrimidinyl-substituted pyrrole derivatives and their use in pharmacy, of the formula 1 in which the variables have the meanings indicated in the de- scription. The compounds according to the invention have immunomodulating and/or cytokine release-inhibiting action and are therefore utilizable for the treatment of disorders which are connected with a disturbance of the immune system.

Full Text

4-Pyridyl- and 2,4-pyrimidinyl-substituted pyrrole derivatives and their use in pharmacy The present invention relates to 4-pyridyl- and 2,4-pyrimidinyl-substituted pyrrole derivatives having immunomodu-lating and cytokine release-inhibiting action, pharmaceutical compositions which contain these compounds, and their use in pharmacy. Pharmacologically active pyrrolizine compounds which inhibit 5-lipoxygenase (5-LO) and cyclooxygenase-1 and -2 (Cox-1 and Cox-2) are already known. For example, pyrrolizine compounds having anti-inflammatory activity are described in Arch. Pharm. 319, 231-234 (1986), 318, 661-663 (1985), 318, 663-664 (1985), 319, 500-505 (1986), 319, 749-755 (1986), 327, 509-514 (1994), 330, 307-312 (1997), and in J. Med. Chem. 1987, 30, 820-823 and 1994, 37, 1894-1897. The most promising compound of this type is the 6-(4-chloro-phenyl)-7-phenyl-2,3-dihydropyrrolo[1,2-a]pyrrole com¬pound ML 3000, see Drugs of the Future, 1995, 20, (10).: 1007-10 09. It suppresses the release of leukotrienes, thromboxanes and prostaglandins. The inhibitory action on the formation of the leukotrienes and the prostaglandins is balanced in this structure, harmful effects of a pure inhibitory action on cy-clooxygenase -1 and -2 (Cox-1 or Cox-2) with increased forma¬tion of leukotrienes are not observed here. In all these com¬pounds, the 1-position of the pyrrolizine structure is unsub-stituted. WO 95/32970, WO 95/32971 and WO 95/32972 relate to compounds of the formula, where one or two of the radicals R1, R2 and R3 can be a mono- or bicyclic, aromatic, heterocyclic radical which has at least one oxygen, sulfur and/or nitrogen atom. These compounds have anti-inflammatory action. Further fused pyrrole compounds and structurally similar com¬pounds are described in US 5,260,451, US 4,546,100 and US 4,584,297; US 4,684,658; US 5,631,122; US 3,920,672; US 4,536,512; US 5,552,422; US 4,539,400; US 4,719,218; EP 608 133 A, DE 198 45 446 A, PCT/EP 99/09057 and DE 100 01 166. It is not disclosed that these compounds have immunomodulating or cytokine release-inhibiting action. Surprisingly, it has now been found that certain fused pyrrole compounds which have a 4-pyridyl substituent on the pyrrole ring have immunomodulating and/or cytokine release-inhibiting action. The present invention therefore relates to the 4-pyridyl- and 2,4-pyrimidinyl-substituted pyrrole derivatives and their use in pharmacy, of the formula I and the optical isomers, physiologically tolerable salts and physiologically easily hydrolyzable esters thereof. In the present case, the physiologically tolerable salts can be acid addition salts or base addition salts. For acid addi¬tion salts inorganic acids are used, such as hydrochloric acid, sulfuric acid or phosphoric acid, or organic acids, such as tartaric acid, citric acid, maleic acid, fumaric acid, ma¬lic acid, mandelic acid, ascorbic acid, gluconic acid and the like. Base addition salts include salts of the compounds of the for¬mula I with inorganic bases, such as sodium or potassium hydro- xide, or with organic bases, such as mono-, di- or trietha-nolamine. Physiologically easily hydrolyzable esters of the compounds of the formula I are, for example, alkyl, pivaloyloxymethyl, ace-toxymethyl, phthalidyl, indanyl and methoxymethyl esters. If the compounds according to the invention have asymmetric centers, racemates and optical isomers (enantiomers, diaste-reomers) are included. The expression "Ci-C6-alkyl" includes straight-chain or bran¬ched alkyl groups, such as methyl, ethyl, n-propyl, i-propyl, n-, i- or t- butyl, sec-butyl, n-pentyl and n-hexyl. The expression "halogen" includes a fluorine, chlorine, bromi¬ne or iodine atom and in particular a fluorine or chlorine atom. If the second of the radicals R1, R2 and R3 is phenyl, this is preferably substituted by a halogen atom, in particular a flu¬orine atom. Preferably, the halogen atom is situated in the 4-position. If the second of the radicals R1, R2 and R3 is thienyl, this is preferably bonded in the 2-position. If the 2-thienyl group is substituted, it is preferably substituted with a halogen atom and in particular in the 5-position. The preparation of the compounds according to the invention is carried out according to various processes, depending on the position of the aromatic radicals and depending on the nature of the heteroaromatic radicals R1, R2 and R3. The [a]-heterocyclically fused pyrrole compounds, in which X = S, or 0, are prepared analogously to the processes described in WO 95/32970, WO 95/32971 and WO 95/32972. Examples 23 and 24 describe how 5H-furan-2-one precursors are condensed with the acetic acid salts of aminoalcohols to give l-hydroxyalkyl-2-pyrrolones, which afford the [a] -hetero-cyclically fused pyrrole compounds with suitable condensing agents {here P2S5 or methanesulfonyl chloride) (scheme 1). In .this case, a pyridine or pyrimidine radical can be introdu¬ced on the one hand via the munchnone/sydnone component, on the other hand via the dipolarophile component. The dipolaro-philes used are dehydrocinnamic acid esters, 3-substituted acetylenecarboxylic acid esters, 2-halogen-substituted cinnamic acids or 2-haloacrylates and nitrostyre-nes. In the group consisting of the pyrrolizines, N-acyl derivati¬ves of proline (pyrrolidine-2-carboxylic acid, cf. examples 1-9, 19, 20, 22) are employed for sydnone formation, in the group consisting of the thiazolo[2,1-b]pyrroles (cf. examples 10 - 14) the N-acyl derivatives of [1,3]-thiazolidine-2-carboxylic acid) are used and in the group consisting of the indolizines N-acyl derivatives of the homologous piperidine-2-carboxylic acid (cf. examples 15-18) are used. For example, the cycloaddition of ethyl 2-bromo-3-(4-pyridyl)-propenoate to the in situ-generated miinchnone of N-(4-fluoro-benzoyl)proline to give the ester from example 1, of ethyl 2-bromo-3- (4-f luorophenyl) propenoate to the miinchnone of N-(isonicotinoyl)proline to give the ethyl ester of the pyrro-lizinecarboxylic acid of example 19 and the cycloaddition of an ethyl 2-fc>romo-3-(4-fluorophenyl)propenoate to the intramo-lecularly cyclized 3-(4-fluorobenzoyl)-[1,3]-thiazol-idine-2-carboxylic acid leads to the pyrrolizine compound from example 10. By the use of 1-nitrostyrenes and N-aroylproline, 7-(or 1-) unsubstituted 5,6- (or 2,3-)diarylpyrrolizine compounds are obtained directly. The reaction of l-fluoro-4-(2-nitrovinyl)benzene with 1-pyridine-4-carbonylpyrrolidine-2-carboxylic acid (N-isonicotinoyl-proline) leads to the compound from example 22. Pyridine and pyrimidine substituents can also be introduced subsequently into the activated pyrrole positions of the pyr- rolizines and indolizines and their thia and oxa analogs (schemes 3 and 4). The reaction of 6-(4-fluorophenyl)-7-methyl-2,3-dihydro-lH-pyrrolizine with the reactive 1-ethoxycarbonyl-pyridinium chloride obtained from ethyl chloro-formate and pyridine affords the compound of example 21 (R1 = CH3, R2 = 4-f luorophenyl) . Scheme 3 In particular the 3-amino-2,4-pyrimidine substituent can be synthesized starting from the acyl derivatives of the monoa-ryl-substituted compounds via condensation with dimethylforma-mide dimethyl acetal and guanidine (scheme 5). The 3-amino-2,4-pyrimidine substituent can be introduced ac¬cording to this method into each reactive, unsubstituted posi¬tion of the pyrrole ring of the pyrrolizidine and indolizidine system. The compounds according to the invention show in vitro and in vivo immunomodulating and cytokine release-inhibiting action. They are thus suitable for the treatment of disorders which are connected with a disturbance of the immune system. For ex¬ample, they are utilizable for the treatment of autoimmune di¬seases, cancer, multiple sclerosis, arthritis, inflammatory bowel disease, septic shock, adult respiratory distress syn¬drome, and in transplantations. The compounds according to the invention can be administered either as individual therapeutic active compounds or as mixtu¬res with other therapeutic active compounds. They can be admi¬nistered as such, but in general they are administered in the form of pharmaceutical compositions, i.e. as mixtures of the active compounds with suitable pharmaceutical carriers or di¬luents . The compounds or compositions can be administered orally or parenterally, but preferably they are given in oral dosage forms. The type of pharmaceutical composition and of pharmaceutical carrier or diluent depends on the desired type of administra¬tion. Oral compositions can be present, for example, as ta¬blets or capsules and can contain customary excipients, such as binders (e.g. syrup, acacia, gelatin, sorbitol, tragacanth or polyvinylpyrrolidone), fillers (e.g. lactose, sugar, corn¬starch, calcium phosphate, sorbitol or glycine), lubricants (e.g. magnesium stearate, talc, polyethylene glycol or sili¬ca), disintegrants (e.g. starch) or wetting agents (e.g. sodi¬um lauryl sulfate). Oral liquid preparations can be present in the form of aqueous or oily suspensions, solutions, emulsions, syrups, elixirs or sprays etc. or as dry powders for reconsti-tution with water or another suitable carrier. Liquid prepara¬tions of this type can contain customary additives, for examp¬le suspending agents, flavorings, diluents or emulsifiers. For parenteral administration, solutions or suspensions with cu¬stomary pharmaceutical carriers can be employed. The compounds or compositions according to the invention can be administered to a mammal {human or animal) in doses of ap¬proximately 0.5 mg to approximately 100 mg per kg of body weight per day. They can be administered in an individual dose or in a number of doses. The spectrum of action of the com¬pounds was investigated with the aid of the following test sy¬stems . In vitro test procedure using human whole blood Human potassium-EDTA whole blood {at 400 [il] is preincubated with test substance for 15 min. at 37°C in a C02 incubator (5% C02; 95% moisture-saturated air). The samples are then stimula¬ted for 4 hours with 1 /zg/ml of LPS (E.coli 026 :B6) at 37QC in a C02 incubator (5% C02,- 95% moisture-saturated air). The reac¬tion is ended by placing the samples on ice, addition of DPBS buffer and subsequent centrifugation (1000 x g; 15 min). The plasma supernatant is used for the quantification of IL-ip and THFa by means of ELISA. In vitro teat procedure using PBMCs The mononuclear cells (PBMCs) are isolated from human potassi-um-EDTA whole blood diluted 1:3 by means of density gradient centrifugation (Histopaque -1.077). After 2 washing steps with DPBS buffer, the mononuclear cells are resuspended in macro-phage-SFM medium and adjusted to a cell count of 1 x 10s cells/ml. The PBMCs suspension (at 390 fil) is preincubated with test substance for 15 min at 37°C in a C02 incubator (5% C02; 95% moisture-saturated air). The samples are subsequently stimula¬ted for 4 hours with 1 jig/ml LPS (E.coli 026-.B6) at 37°C in a C02 incubator (5% C02, 95% moisture-saturated air). The reac¬tion is ended by placing the samples on ice, addition of DPBS buffer and centrifugation (15880 x g; 12 min). The supernatant is used for the quantification of IL-lp and TNFcc by means of ELISA. In vitro test system for determining the inhibition of 5-lipoxygenase Human granulocytes are used as a source of the 5-lipoxygenase. LTB4 (leukotriene B4) is formed from endogenous arachidonic acid by means of stimulation with calcium ionophore A 23187. The granulocytes are isolated and the enzyme reaction is car¬ried out according to known processes (see Arch. Pharm. Pharm. Med. Chem. 330, 307 - 312 (1997)). The blood, which is protected from clotting with heparin, is centrifuged on a discontinuous Percoll® gradient and the gra¬nulocyte layer is pipetted off. After lysis of the erythrocytes, the granulocytes are washed a number of times and then adjusted to a specific cell count. The enzyme reac¬tion is then started with calcium ionophore A 23187 in the presence or absence of the test substance after addition of Ca2+. The synthesis of the leukotrienes is stopped after 1.5 minutes. The samples are centrifuged off and the superna¬tant is diluted. LTB4 is determined quantitatively by means of ELISA. In vitro test system for determining the inhibition of cy-clooxygenase-1 In this test system, the amount of prostaglandin E2 formed from human platelets after addition of calcium ionophore is determined by means of ELISA. In this process, the platelets are obtained after centrifugation on a discontinuous Percoll® gradient. The enzyme reaction and the determination of the me¬tabolites formed is carried out in principle as in the deter¬mination of 5-lipoxygenase inhibition. Differences exist with respect to the incubation time. Furthermore, the addition of a thromboxane synthesis inhibitor is necessary (see Arch. Pharm. Pharm. Med. Chem. 330, 307 - 312 (1997)). In vitro test system for determining the inhibition of cy-clooxygenase-2 COX2 {from sheep placenta) is preincubated at 4°C with test substance for 10 min, then stimulated with arachidonic acid (5 fiM) at 25°C for 10 min. Diclofenac is used as a reference (IC50(COX2) = 3.0 10"6 M) . The determination is carried out at 3 dilutions (10-7, 10~6, 10"5 M) . The PGE2 concentrations are quantified by means of ELISA (see Mitchell J.A. et al., Proc. Nat. Acad. Sci. 90: 11693-11697 (1993)). Example IA: Ethyl 3 -(4-fluorophenyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-l-carboxylate a) N-(4-Fluorobenzoyl)proline L-Proline (15.0 g, 130 mmol) is dissolved in NaOH (5%, 150 ml, 190 mmol) and the solution is cooled in an ice bath (0-5°C). 4-Fluorobenzoyl chloride (19.0 g, 120 mmol) is added dropwise with vigorous stirring, the cooling ia removed and stirring ia continued for 1 h. After acidifying the reaction mixture with HCl (10% strength, 45 ml) the amide deposits in large lumps, which are comminuted, suspended using water, filtered off with suction and washed with water (50 ml). The substance is dried over P205 in vacuo: 24.41 g. M.p.: 174.0°C, yield: 79%; Ci2H12FN03; MW = 237.23. IR (KBr): l/X. (cm-1) - 1735, 1605, 1585, 1514, 1440, 1230, 1180, 1161, 856, 762 513; - ^-NMR (CDCl3:) 6[ppm] = 7.64 - 7.57 (m, 2H, ) ; 7.16 - 7.07 (m, 2H); 4.78 - 4.71 (m, CH); 3.63 - 3.57{CH2); 2.36 - 1.85 (m; 2 CH3) . b) Bromocarbethoxymethylenetriphenylphosphorane Carboethoxymethyltriphenylphosphonium bromide (43 g, 100 mmol) is dissolved in water (100 ml) and cooled in an ice bath. NaOH (10%, 40 ml, 100 mmol) is added dropwise at 0-5°C until a pH of 9 is reached. The deposited resinous mass is separated off, digested with ether and the crystals formed are filtered off with suction (31 g, 87%). The substance is dried over CaCl2 in a desiccator in the dark. The dried compound (carboethoxymethylidenetriphenyl-phosphorane, 30 g, 0.086 mol) is dissolved in CH2C12 (160 ml) and the solution is cooled to 5°C in an ice bath. A solution of bromine (13.9 g , 0.087 mol) in CH2Cl2 (40 ml) is slowly ad¬ded dropwise and the batch is stirred for a further 30 min un¬til the disappearance of the bromine coloration. The organic phase is washed first with water {50 ml), then twice with NaHC03 solution {100 ml) in a separating funnel un¬til all of the HBr is neutralized. The CH2Cl2 phase is dried over Na2S04 sice, and concentrated in vacuo. The residue is crystallized from acetone/n-hexane (50 ml, 2:1). The crystals are washed with this mixture (40 ml) and dried in vacuo: 27.5 g. M.p.: 151.9°C, yield: 75%; C22H20Br02P; MW = 427.28. IR (KBr) : l/X (cm"1) = 2981, 1650, 1583, 1434, 1301, 1101, 693; ^-NMR (CDC13:} 5[ppm] = 7.73 - 7.44 (m; 15H, ar. ) ; 3.935 (q; J=7 Hz, 2H) ; 0.885 {t; J=7 Hz, CH3). 13C-NMR (CDCI3:) 8[ppm] = 162.5, 149.8, 141.8, 137.9, 123.7, 118.1, 63.2, 14.1. c) Ethyl 2-bromo-3-(4-pyridyl)propenoate Bromocarbethoxymethylenetriphenylphosporane (9.0 g, 21 mmol) is dissolved in toluene (60 ml) with the exclusion of light and then a solution of isonicotinaldehyde (4-pyridinecarbaldehyde, 2.14 g, 2 0 mmol) in toluene (9 ml) is added. The batch is stirred in the dark at RT for 16 h. The solution is then concentrated in vacuo, the residue is dige¬sted with ether (40 ml) and the ether phase is filtered off with suction from the crystalline solid. The crystals are washed a further 2 times with ether {10 ml) and the collected ether solutions are concentrated in vacuo. The residue which remains {6.63 g) is purified by column chromatography {cc) on A1203 using an ether/n-hexane mixture (2:1). The substance sought appears in the fractions 1-5: 4.9 g of dark brown oil. Yield: 95.7%; C10H10BrNO2; MW = 256.10.; - Hl-NMR (CDCI3:) 5[ppm]: 8.72 - 8.69 / 7.66 - 7.63 (AA"BB"; 4H, ar.); 8.12 (s, 1H) ; 4.43 - 4.32 (q, J=7.1Hz, 2H, CH2) ; 1.44 -1.37 (t; J=7.1 Hz, CH3) 13C-NMR (CDC13:) 5[ppm]: 162.5,; 149.8,; 141.8,; 137.9,; 123.7,; 118.1,; 63.2,; 14.1 d) Ethyl 3-(4-fluorophenyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate N-(4-Fluorobenzoyl)proline (9.48 g, 40 mmol) is suspended in acetic anhydride (60 ml), raised to a temperature of 80°C in a reflux apparatus under argon until a clear solution is ob¬tained (20 min), then treated dropwise with ethyl 2-bromo-3-(4-pyridyl)acrylate (12.28 g, 8 mmol) in toluene (10 ml) (8 min) and the reaction vessel is immersed in a prepared hot oil bath (120°C). The dark mixture is heated under reflux for 21 h, whereupon starting material is no longer detectable by tic (Ala03; ethyl acetate/n-hexane 1:1}. The reaction solution is cooled and treated with ethyl acetate (50 ml), and the or¬ganic supernatant is poured off. The solid deposited in the flask is digested 2 times with ethyl acetate (30 ml) in the presence of heat. Supernatant and ethyl acetate solutions are combined and concentrated in vacuo. The residue is taken up in ethyl acetate (200 ml) and the ethyl acetate phase is washed until neutral with water (100 ml) , NaHC03 solution (100 ml) and water again (100 ml), dried (Na2S04 sice.) and concentrated. A pale beige solid crystallizes from the concentrated ethyl ace¬tate phase (30 ml). After filtering off with suction, washing (ethyl acetate) and after drying, 2.93 g of the product sought remain. After concentrating the mother liquor, a further 2.1 g of a crystallizate are obtained which is a mixture of product and by-product. Yield: 21%, C2iH19FN202; MW = 350.40. IR (KBr) : l/X (cm"1) = 2985, 1695, 1510, 1222, 1136, 1093, 839, 584, 525 LH-NMR (CDC13:) S[ppm] = 8.46 - 8.43 / 7.14 - 7.11 (AA"BB"; 4H, -pyridyl); 7.10 - 6.92 (m; 4H, ar.); 4.22 - 4.12 (q; J=7.1Hz, 2H); 4.02 - 3.95 (t; J=7.2Hz, 2H); 3.27 - 3.19 (t; J=7.5Hz, 2H); 2.63 - 2.48 (m; J=7.3Hz, 2H); 1.24 - 1.17 (t;J=7.2Hz, CH3) 13C-NMR (d6-DMSO) : 6[ppm] = 164.5, 148.9, 145.2, 143.5, 131.Z, 131.0, 127.2, 156.0, 115.8, 115.4, 59.4, 46.8, 26.6, 26.4, 14.3. Example IB: Ethyl 3-(4-fluorophenyl)-1-{4-pyridyl)-6,7-dihydro-5H-pyrroIizine-2-carboxylate CC separation of the mixed crystallizate (2.1 g) obtained un¬der example 1A, d): Separation on AI2Q3- ether /THF 9:1: fractions 6-9: substance 1A (1.15 g) Fraction 10 - 12: mixture of 1A + IB; fractions 13 - end: substance IB (0.3 g); yield: 0.3 g (2%) C2iH19FNa02; MW = 350.40. IR (KBr) : lA (cm-1) = 2983, 1702, 1600, 1523, 1489, 1435, 1218, 1171, 1161, 1028, 849, 834, *H-NMR (CDCI3) 5[ppm] = 8.56 - 8.53 / 7.32 - 7.29 13C-NMR (CDCI3) : 5[ppm] = 165.1; 163.8; 160.1; 149.2; 143.7; 136.7; 133.0; 131.8; 131.6; 127.8; 123.8; 115.2; 114.8; 59.7; 46.1; 27.0; 24.5; 13.7 Example 2: 3-(4-Fluorophenyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-l-carboxylic acid Ethyl 3-(4-fluorophenyl)~2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate (example 1A, 1.0 g, 2.8 mmol) is re-fluxed in an ethanolic KOH (10%, 10 ml, 18 mmol) for 16 h. The ethanol is then evaporated in vacuo, and the residue is taken up in water (10 ml) and neutralized using dil. HCl until the free acid has completely deposited. This is filtered off with suction, washed with water and dried in vacuo. 0.78 g is ob¬tained. M.p. : dec; yield: 85%; C19H1SFN202; MW = 322.34. IR (KBr) : l/l {cm"1) = 1683, 1602, 1512, 1149; - ^-NMR (CDC13 / d6-DMSO) 8[ppm] = 8.40 - 8.37 / 7.19 - 7.16 (AA"BB1; 4H, -pyridyl); 7.07 - 6.92 {m; 4H, ar.); 3.98 (t; J-7.1HZ, CR2) ; 3.23 (t; J=7,4 Hz, CH2) 2.92 (S; OH); 2.54 (t; J=7.3Hz, CH3) . 13C-NMR (CDC13 / de-DMSO) : 5[ppm] = 165.8, 164.2, 159.3,; 148.4,; 145.3,; 143.6, 131.2, 131.0, 127.4, 127.3, 126.5, 126.0, 123.8, 115.6, 115.2, 105.9, 46.6, 26.5, 26.2. Example 3: [3-(4-Fluorophenyl)-2-{4-pyridyl)-6,7-dihydro-5H-pyrrolizin-1-yl]methanol Ethyl 3-(4-fluorophenyl)-2-(4-pyridyl)- 6,7-dihydro-5H-pyrrolizine-1-carboxylate (example 1A, 4.56 g, 13 mmol) is dissolved in abs. THF (100 ml) under argon and Na bismethoxye-thoxyaluminum hydride (VitrideR) is added dropwise through a septum via the cannula of a syringe (20 min). The mixture is stirred at 50°C for 2 h, whereupon starting material is no longer detectable by tic (A1203 - ethyl acetate/n-hexane 3:7), then it is allowed to cool. H20 (25 ml) is cautiously added dropwiae to the reaction solution, then it is concentrated in vacuo (THF evaporates), and the aqueous or¬ganic residue is treated with ethyl acetate (100 ml). The pha¬ses are separated. The organic phase is washed 2 times with water (40 ml), dried over Na2S04 sice, and concentrated in vacuo {5.0 g) . The reddish brown-colored, resinous residue is crystallized from diethyl ether (10 ml). The crystals are washed with ethyl acetate (5 ml) and ether (5 ml) and dried. 3.67 g of the compound sought remain Yield: 91.5%; Ci9H17FN20; MW = 308.35; Hl-NMR (CDCI3) : 6[ppm] = 8.43 - 8.40 and 7.21-7.18 (AA"BB"; 4H, -pyridyl); 7.18 - 7.12 (m; 2H, ar.); 7.05 - 6.95 (m; 2H, ar. ) ; 4.55 {s; CH2) ; 3.96 (t; J=7.0 Hz, CH2); 3.01 (t; J=7.3 Hz, CH2) ; 2.53 (quin; J=7.1 Hz, CH2) . Example 4: 5-(4-Fluorophenyl)-7-methyl-6-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine [3-(4-Fluorophenyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizin-1-yl]methanol (3.08 g, 10 mmol) is heated with hydriodic acid (57%, 18 ml, 134 mmol HI) in an oil bath at 120DC (reflux). The initially undissolved substance has dispersed in the batch after 45 min, and starting material (rf=0.05) is no longer de¬tectable (product rf=0.9, iodide rf= 0.6) by tic (ether, A1203) . After cooling (lh), the solution is diluted with 50 ml of water and covered with a layer of 100 ml of ethyl acetate. The water phase is carefully neutralized with sat. Na2C03 soln (30 ml) and the phases are separated. The water phase again extracted with ethyl acetate (50 ml), the combined ethyl ace¬tate extracts decolorized using sodium thiosulfate solution (Na2S203, 2% strength, 40 ml) and, after washing again with wa¬ter (50 ml), dried over Na2S04 sice. After evaporating the sol¬vent in vacuo, 2.28 g of residue remain, which solidifies from CH2Cl2/ethyl acetate to give a resinous mass. The substance is purified by CC (Al203/ether) and the substance obtained from the fractions by evaporating the solvent (fractions 1-17, 1.74 g) is crystallized from diisopropyl ether. 1.37 g of pure com¬pound are obtained. Yield: 47%; C19H17FN2; MW = 292.36 H{-NMR (CDClj) 5[ppm] = 8.45 - 8.41 / 7.07 - 7.03 (AA" BB" ; 4H, -pyridyl) ; 7.17 - 6.93 (m; 4H, ar.) ; 3.945 (t; J=6.9 Hz, CH2) ; 2.88 (t; J=7.2 Hz, CH2) ; 2.51 (quin; J=7.0 Hz, CH2) ; 2.10 (s; CH3) 13C-NMR (CDClj) :"5[ppm] = 164.2; 159.2; 149.5; 144.7; 135.5; 130.7; 130.6; 128.6; 128.5; 124.9; 124.6; 122.8; 115.7; 115.3; 108.4; 46.1; 27.2; 23.3; 10.5 Example 5: 5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydro-1H-pyrrolizine Ethyl 3-(4-fluorophenyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate (example 1A, 2.63 g, 7.5 mmol) is firstly dissolved at RT using hydriodic acid (57%, 7.5 ml, 56 mmol HI). The hydroiodide which has crystallized out again after a few minutes is brought into solution again by warming to 70°C and the mixture is refluxed for 2 h. In this time, af¬ter about 45 min and after 1 h, in each case 2 further porti¬ons of HI (57%, a 3 ml, 45 mmol) are added. After passage of the reaction time, starting material (rf=0.4) is no longer de¬tectable by tic (Al203, ether -THF 9:1). For the isolation of the product (rf = 0.55), the precipitate of the crystallized hydriodide product formed on cooling is filtered off with suc¬tion, purified of adhering HI by washing with water (3 times 10 ml) and dried. 2.57 g of hydriodide (84.3%) are isolated. Isolation of the base: 5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine hydriodide (3.68 g, 9 mmol) is suspended in CH2C12 {150 ml) and intensively stirred with saturated NaHC03 solution {100 ml). The CH2CI2 phase is then separated off, dried using Na2S04 sicc. and concentrated in vacuo. The residue is taken up in a little ether and the crystals formed are filtered off with suction and dried: 2.39 g. Yield: 80%, C1BH15FN2; MW = 278.33 IR (KBr) : 1A (cm"1) = 1594, 1525, 1508, 1426, 1356, 1216, 833, 787; - TH-NMR (CDC13) 5[ppm] * 8.38 - 8.35 / 7.11 - 7.09 (AA"BB"; 4H, -pyridyl) ; 7.31 - 7.24 (ttij 2H, ar.) ; 7.11 - 7.02 (m; 2H, ar.); 6.15 (s; 1H) ; 3.89 (t; J=7.0Hz, CH2) ; 2.945 (t; J=7.2Hz, CH2) ; 2.51 (quin; J=7.0Hz, CH2) ; - 13C-NMR (CDCI3) : 5[ppm] = 160.0, 157.0, 149.2, 145.0, 137.7, 131.2, 131.1, 128.8, 122.0, 116.1, 115.6, 99.8, 45.9, 27.4, 24.5 Example 6A-. Ethyl 3 - (2- thienyl) -2- (4 -pyridyl) -6 , 7-dihydro-5H- pyrrolizine-1-carboxylate a) N-(2-Thienylcarbonyl)proline L-Proline (2.42 g, 21 mmol) is dissolved in NaOH (5%, 30 ml, 38 mmol) and the solution is cooled in an ice bath (5°C). Thiophene-2-carbonyl chloride (2.93 g, 20 mmol) is slowly ad¬ded dropwise with stirring (10-15 min), in the course of which the temperature should not exceed 7°C. The mixture is stirred at 5-7°C for Ih, the cooling is removed and stirring is conti¬nued for 1 h at RT. After acidifying the reaction mixture with HCl (10% strength, 12 ml) the amide deposits in oily form. The oil is extracted with ethyl acetate (300 ml), the ethyl aceta¬te phase is washed a number of times with water (200 ml), dried (Na2S04 sice.) and the solvent is evaporated in vacuo. The residue {4.16 g) is suspended twice using hot water (20 ml), filtered off with suction and washed with diisopropyl ether (1Q ml). The substance is dried over P205 in vacuo (tic: RP 18 / MeOH, rf=0.75): 3.87 g. M.p.: 143.0°C, yield: 81.6%; Ci2H12FN03; MW - 237.23. IR (KBr) : 1/X. (cm*1) = 3091, 3078, 1717, 1601, 1524, 1439, 1406, 1262, 1240, 1195, 773, 757, 736; - ^-NMR (CDC13:) 8[ppm] = 7.70 and 7.68 (d; J=3.7Hz, IH) 7.62 and 7.59 (d; J=5.0Hz,lH) 7.16 -7.12 (dd; IH) 4.85-4.79 (m; IH) 3.94-3.87 (m; CH2) 2.50 (m;lH) 2.12 (m; 3H); b) Ethyl 3-(2-thienyl)-2-(4-pyridyi)-6,7-dihydro-5H-pyrrolizine-1-carboxylate N-(2-Thienylcarbonyl)proline (4.69 g, 21 mmol) is dissolved in acetic anhydride (15 ml) at 60°C (15 min), ethyl 2-bromo-3-(4-pyridyl)propenoate (6.40 g, 25 mmol) is added to the cle¬ar solution and the mixture is heated at 90°C for 16 h, whe¬reupon a tic sample (Al202-ethyl acetate/THF 9:1) no longer in¬dicates starting material. The cooled reaction mixture is treated with ethyl acetate (120 ml) and intensively stirred with saturated Na2C03 solution (80 ml) for 15 min and diluted with water (50 ml). The ethyl acetate phase is separated off, the water phase is extracted with a further 3 portions of et-hyl acetate (150 ml), and these organic phases are combined, washed with saturated Na2C03 soln (50 ml) and, after drying (K2C03 sicc), concentrated in vacuo. 8 g are obtained as a re¬sidue, which is dissolved in a little ethyl acetate and puri¬fied by cc (Al203-ethyl acetate/n-hexane 2:1). Fractions 6-12: contain the substance sought, which crystalli¬zes from ether/diisopropyl ether, is filtered off with suction and dried: 2.63 g. Yield: 37%, Ci9H18N202S, MW = 338.43; ^-NMR {CDC13:) 5[ppm] = 8.52 - 8.49 / 7.23 - 7.20 (AA"BB1; 4H, -pyridyl and 1H; -thiophene) ,- 6.925 (dd; J=3.6Hz, 1H) ; 6.75 (d; J=3.5Hz, 1H) ; 4.20 - 4.07 {m; 4H, CH3) ; 3.23 (t; J=7.5Hz, CH2) ; 2.575 (quin; J=7.3Hz, CH2) ; 1.173 (t; J=7.1Hz, CH3) Fractions 13-15: Mixed fraction with product from example 6B: 0.23 g Example 6B: Ethyl 3 -(2-thienyl)-1-(4-pyridyl) -6,7-dihydro-5H-pyrrolizine-2~carboxylate From CC purification of example 6A (Al203-ethyl acetate/n-hexane 2:1): Fractions 19-30: contains the positional isomer compound, which likewise crystallizes in pure form from ether/diisopropyl ether, is filtered off with suction and dried: 0.19 g. Fractions 31 - end: contains compound 6B contaminated with N-(2-thienylcarbonyl)proline. Yield: 2.7%, C19H18N202S, MW = 338.43; Hl-NMR (CDCI3:) 5[ppm] = 8.56 - 8.53 (AA"BB"; 2H, -pyridyl); 7.43 - 7.40 {d; J=3.1Hz, 1H, -thiophene); 7.30 - 7.29 (m,- 3H, -pyridyl and -thiophene); 7.12 - 7.08 (dd; J=3.7 Hz, 1H); 4.15 - 3.99 (m; 4H, CH2) ; 2.99 (t; J=7.3 Hz, CH2) ; 2.53 (quin; J=7.2HZ, CH2) ; 1.035 (t; J=7.2 Hz, CH3) . Example 7: 3-(2-Thienyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylic acid analogously to example 2: Ethyl 3-(2-thienyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate (example 6A, 1.5 g, 4.4 mmol) is stirred in et-hanolic KOH (8%, 15 ml, 21 mmol) for 16 h at 60°C, the ethanol is evaporated in vacuo, and the residue is suspended in water (40 ml) and brought to pH4 in an ice bath using dil. H3P04 (8%). The red-brown precipitate formed is filtered off with suction, washed with water and dried in vacuo. 1.17 g are ob¬tained. M.p.t dec; yield; 85%; Ci3Hi5FN202; MW = 322.34. IR (KBr) : 1/X (cm"1) = 1676, 1604, 1567, 1420, 1305. 1196, 1012, 852, 702; - Hl-NMR {CDC13) 5[ppm] = 8.49 - 8.46 / 7.53 - 7.50 (AA ■ BB" ,- 4H, -pyridyl); 7.335 (d; J=3.1Hz, 1H, -thiophene); 7.00 (d; J=3.7HZ, 1H) ,- 6.81 (dd, 1H, -thiophene); 4.79 (s, OH) 4.07 {t; J=7.1 Hz, CH2) ; 3.28 (t; J=7.3Hz, CH2) ; 2.585 (m; CH2). Example 8: 5-(2-Thienyl)-6-(4-pyridyl)-2,3-dihydro-1H-pyrrolizine 3-(2-Thienyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-l-carboxylic acid {example 7, 0.2 g, 0.64 mmol) is heated under argon in a 10 ml flask by immersing in a metal bath at 250°C. Evolution of C02 takes place immediately, and the substance melts and turns black. After cooling, the solidified, glassy melt is taken up in CH2C12 (10 ml) and filtered through Al203 (TSC, Baker). The filter cake is eluted with diethyl ether. The eluate is concentrated and crystallizes from ether / dii-sopropyl ether in the cold: white crystals 0.04 g. Yield: 23%; C16H14N2S; MW = 266.37. ^-NMR (CDC13) 5[ppm] = 8.44 - 8.41 / 7.27 - 7.24 {AA"BB"; 4H, -pyridyl); 7.385 (dd, 1H, -thiophene); 7.07 (d; 2H, - thiophene); 6.99-6.97 Id; 1H, -thiophene); 6.16 (s; 1H); 3.955 (t; J=7.1 Hz, CH2) ; 2.94 (t; J= 7.3 Hz, CH2) ; 2.52 (quin; J= 7.2 Hz, CH2) . Example 9A: Ethyl 3-(5-chloro-2-thienyl)-2-(4-pyridyl)-6,7-di-hydro-5H-pyrrolizine-1-carboxyiate a) (5-Chloro-2-thienylcarbonyl chloride 5-Chlorothiophene-2-carboxylic acid (4.0 g, 24.6 mmol) is dis¬solved in dichloroethane (10 ml) and thionyl chloride (S0C12, 2.7 ml, 4.4 g, 37 mmol} is added, after inoculating with a drop of DMF the batch is heated to 50°C (IT). The course of the reaction is monitored by tic (Si02 / ether: product rf 0.8, starting material rf 0.1-0.3). After 1.5 h and after 2.5 h, in each case S0C12 (5 drops) was added. After 4.5 h, the pale yel¬low solution is concentrated on a Rotavapor and the residue is fractionally distilled: at 50 tnbar 4.0 g of product (89.9%) is obtained at the distillation temperature of 110°C. Yield: 4.0 g ( 90%); C5H2C120S; MW = 181.04. ;H-NMR (CDC13:) 6[ppm] = 7.80 / 7.05 (AB; 2H, J[AB) = 4 Hz) b) N-(5-Chloro-2-thienylcarbonyl)proline 5-Chlorothiophene-2-carbonyl chloride {3.62 g, 20 mmol) is slowly added dropwise with stirring (10-15 min) to a solution of L-proline (2.42 g, 21 mmol) in NaOH (5%, 32 ml, 40 mmol) cooled to 5°C in an ice bath, the temperature not exceeding 9°C. The mixture is stirred at 5-7°C for 30 min, in the course of which a precipitate slowly forms which is brought into so¬lution again by addition of water (8 ml). The batch is stirred at RT for a further 90 min. After acidifying the reaction mix¬ture with HCl (10% strength, 12 ml, pH 3.5), the amide depo¬sits in crystalline form after stirring for 30 min. The cry¬stals are filtered off with suction, washed a number of times with water (200 ml) and dried: crystallizate 1 = 2.61 g. The mother liquor is acidified to pH 1-2 using HCl and the vo¬luminous precipitate formed is likewise filtered off with suc¬tion and washed until neutral with water and dried: crystal-lizate 2: 2.17 g. Both crystallizates are the substance sought: total yield 4.78 g. Yield: 92%; C10H10ClNO3S; MW = 259.71. ^-NMR {CDC13:) S[ppm] = 8.50 (s; OH) 7.43 / 6.94 (AB; 2H, -thiopherie, J(M, = 4 Hz); 4.77 - 4.72 (m; 1H) ; 3.91 - 3.77 (m; CH2) ; 2.37 - 2.12 {m; 4H, CH2) . c) Ethyl 3-(5-chloro-2-thienyl)-2-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate N-(5-Chloro-2-thienylcarbonyl)proline (1.1 g, 4.2 mmol) is dissolved in acetic anhydride (3 ml) at 50°C (IT) (15 min), ethyl 2-bromo-3- (4-pyridyl)propenoate (1.29 g, 5.0 mmol is ad¬ded to the clear solution and the mixture is heated at 90°C for 22 h, whereupon a tic sample (Al203-ethyl acetate/THF 9:1) no longer indicates starting material. The cooled reaction mixture is treated with ethyl acetate (50 ml) and water (50 ml) and intensively stirred for 15 min. The phases are separated, the water phase is treated to impro¬ve the phase separation with saturated NaCl solution (50 ml) and extracted with a further 3 portions of ethyl ace¬tate (150 ml). After this, the water phase is neutralized to pH 7-8 using sa¬turated Na2C03 soln (50 ml) and again extracted with ethyl ace¬tate (50 ml). The ethyl acetate phases are collected and combined, washed with saturated Na2C03 soln (50 ml) and water (50 ml) and, after drying (K2C03 sicc), concentrated in vacuo. 1.2 g are obtained as a residue, which is dissolved in a little THF and purified by cc (Al203 (300 g)-ether/THF 9:1). Fractions 1-3 0: contain the substance sought, which crystalli¬zes from ether/diisopropyl ether, is filtered off with suction and dried: 0.6 g. Yield: 38%, C19Hi7ClN202S, MW = 372.88; :H-NMR (CDC13:) 8[ppm] = 8.54 - 8.51 / 7.30 - 7.28 (AA"BB"; 4H, -pyridyl); 6.75 / 6.53 (AB; 2H, -thiophene, J(fiB) = 4 Hz); 4.20 -4.04 (m, 4H, CH2) ; 3.22 (t; J=7.5Hz, CH2) 2.59 (quin; J=7.3Hz, CH2) ; 1.17 (t; J=7.1Hz, CH3) . Example 9B: Ethyl 3-(5-chloro-2-thienyl)-1-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine~2-carboxylate From CC purification of example 9A (Al203-ether/THF 9:1): Fractions 35 - 60: contains the positional isomer compound, which likewise crystallizes in pure form from ether/ diisopro-pyl ether, is filtered off with suction and dried: 0.11 g. Yield: 1.5%, d9H17ClN202S, MW = 372.88; ^-NMR (CDC13:) 5[ppm] = 8.56 - 8.53 / 7.34 - 7.31{AA"BB"; 4H, -pyridyl); 7.03 / 6.91 (AB; 2H, -thiophene, J(AB) = 4 Hz); 4.17 -3.99 (q + t; 4H, CH2) ; 3.00 (t; J=7.3Hz, CH2) ; 2.545 (quin; J=7.2HZ, CH2) ; 1.07 (t; J=7.1Hz, CH3) - Example 10A: Ethyl 5-(4-fluorophenyl)-6-(4-pyridyl)-2,3-dihydropyrrolo- [2,1-b]-thiazole-7-carboxylate a) Ethyl thiazolidine-2-carboxylate Ethyl glyoxalate (50% in toluene, 40.92 g, 0.2 mol), diluted with toluene (15 ml), is cooled to 5°C, cysteamine hydrochlo¬ride (22.72 g, 0.2 mol) is added and a saturated NaHC03 soluti¬on (8.7% strength, 120 ml) is slowly added dropwise (2 h). The temperature is kept below 15°C during the dropwise addition. The 2-phase system is stirred at RT for 16 h. The reaction is checked by means of GC: HP17, 10 m, 0.53 mm; Temp.: 120°C (0.5 min), 20°C / min, 180°C (1 min), inj 22Q°C, det. 280°C; rt 2.57. After this, the toluene phase is separated off and the aqueous phase (pH 7-8) is extracted with ether (150 ml). Toluene phase and ether phase are dried over Na2S04 (sice.) and concentrated and the oily residues are purified: 26.9 g. Yield (crude) : 83.5%, C6HnN02S, 161.22 g/mol ,- IR (KBr) : 1/X (cm-1) = 3303, 2980, 2939, 1733, 1672, 1516, 1443, 1369, 1282, 1182, 1026; - Hl-NMR {CDCI3O 5[ppm] = 4.92 (s,lH); 4.25 (q, 2H, J=7.1Hz); 3.66 (m, 1H); 3.10 - 2.95 (m, 2H); 2.90 - 2.78 {m, 1H); 2.44 (s, OH ); 1.305 (t, 3H, J=7.1Hz). b) Ethyl 3-(4~fluorobenzoyl)thiazolidinecarboxylate The solution of ethyl thiazolidine-2-carboxylate (24.18 g, 0.15 mol) in abs. CH2C12 (80 ml) is treated dropwise at RT with the solution of 4-fluorobenzoyl chloride (23.78, 0.15 mol) in abs. CH2C12 (20 ml). The solution warms to 38°C, the solvent begins to boil and HC1 is released. It is kept under reflux for 4 h with heating. The CH2Cl2 phase is extracted by stirring (3 0 min) with Na2C03 soln (100 ml}, washed with water (50 ml) and separated off. It is dried over Na2S04 (sice.) and concentrated. The residue which remains is crystallized from diisopropyl ether (30 ml), and the crystals are washed with diisopropyl ether (25 ml) and dried: 34.07 g. Yield: 80.2%, d3H14FN03S, MW = 283.32; Hi-NMR (CDCI3:) 5[ppm] = 7.52 (m; 2H, ar. ) ; 7.17 - 7.05 (m; 2H, ar.); 4.30 - 4.20 (q; J=7.1 Hz, CH2) ; 3.98-3.87 (m; CH2) ; 3.32 - 3.19 (m; 1H); 3.09 - 2.98 (m; 1H); 1.305 (t; J=7.1 Hz, CH3}. c) 3-(4-Fluorobenzoyl)thiazolidinecarboxylic acid Ethyl 3-(4-fluorobenzoyl)thiazolidinecarboxylate (2 8.33 g, 0.1 mol) is suspended in ethanolic KOH (5% strength, 165 ml, 0.15 mol) and the mixture is subsequently heated at 50QC (IT) for 2 h. The cooled solution is acidified (pH 2-3) with water (100 ml) and dil. phosphoric acid (8%, 150 ml). Precipitated salts are brought into solution again by addition of water (150 ml). This aqueous solution is extracted with diethyl ether (500 ml), the ethereal extracts are washed with sat. NaCl solution (100 ml), dried over Na2S04 (sice.) and concen¬trated in vacuo. The residue is crystallized from diisopropyl ether (40 ml): 24.87 g. Yield: 97.5%, CuHioFN03S# MW = 255.27; ^-NMR (CDCl3:) 8[ppm] = 8.64 (s; 1H, OH); 7.59 - 7.53 (m,- 2H, ar.); 7.19 - 7.09 d) Ethyl 5-(4-fluorophenyl)-6-(4-pyridyl)-2,3-dihydropyrrolo-[2,1-b]-thiazole-7-carboxylate The clear solution of 3-(4-fluorobenzoyl)thiazolidine-carboxylate (12.76 g, 0.05 mol) in acetic anhydride (60 ml) Dbtained at 90°C is treated with ethyl 2-bromo-3-(4-pyridyDpropenoate (13.8 g, 54 mmol) and stirred at 80°C (IT) for 4 d. The black-colored reaction mixture is concentrated in vacuo and, after cooling, treated with MeOH (10 ml). After the reaction is complete, residual acetic anhydride is again concentrated in vacuo and the residue (30 g) is dissolved com¬pletely in MeOH (7 ml) in the presence of heat. Product 10 A crystallizes at RT (TLC: Al203, ethyl acetate/n-hexane 6:4; rf = 0.45). The crystal magma is filtered off with suction, the crystals are collected {2.6 g) and the mother liquor is placed in the cold (0°C) to obtain a further crystal fraction (2.16 3) : 4.42 g (24%) \fter filtration, the mother liquor is diluted with CH2C12 (20 ml) and filtered through a little Al203. The A1203 is washed rfith CH2Cl2 {150 ml) and the eluates are concentrated: 5.78 g (mixture of product A, rf = 0.45 and B, rf = 0.5). The yellow-colored crystals of the two crystal fractions are cashed with a little cold MeOH and dried: Yield: 24%, CaoHnFNaOaS, MW = 368.43; IR (KBr) : 1/X (cm"1) = 3066, 2992, 2786, 1722, 1692, 1627, 1520, 1377, 1226, 1147, 820, 596; - ^-NMR (CDC13:) 6[ppm] = 8.57 - 8.55 / 7.33 - 7.30 (AA" BB" ; 4H, -pyridyl); 7.47 - 7.40 (m; 2H, ar.); 7.18 - 7.10 (m; 2H, ar. ) ,-4.11 - 3.99 (q + t; 4H, CH2) ; 3.69 (t; J=7 . 0 Hz, CH2) ; 0.98 Example 10B: Ethyl 5-(4-fluorophenyl)-7-(4-pyridyl)-2,3-dihydropyrrolo-[2,1-b]-thiazole-6-carboxylate From the mixture (5.78 g) of product A (rf = 0.45) and B (rf = 0.5) obtained under example 10 A, small fractions of pure pro¬duct 10 B are obtained by CC on A1203 using the eluent ethyl acetate/n-hexane (6:4) : C20H17FN2O2S, MW = 368.43; ^-NMR (CDCI3:) 6[ppm] = 8.44 - 8.41 / 7.36 - 7.33 (AA ■ BB" ; 4H, ar.); 7.11 - 7.00 Example 11: 5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydro-pyrrolo- [2,1-b]-thiazole-7-carboxylic acid The compound of example 10 A (1.0 g, 2.7 mmol) is cleaved com¬pletely (tic) in 4 h by boiling under reflux in ethanolic KOH (10%, 10 ml, 18 mmol). The ethanolic liquor is concentrated in vacuo, the salt-like residue is taken up in water (40 ml) and the excess of alkali is neutralized (pH 4-5) using H3P04 (8%) to the extent that the suspension does not assume a gelatinous consistency. The solid is filtered off with suction, washed with water and dried over P205 in an evacuated desiccator for 24 h: 0.87 g of pale yellow powder M.p. 210.5°C, yield: 94.6%; CiaHi3FN202S, MW = 340.38; IR (KBr) : lA (cm"1) = 3399, 1672, 1599, 1534, 1494, 1228, 1160. - Hl-NMR (de-DMS0 / CDC13) : 5[ppm] = 8.55 - 8.52 / 7.91 - 7.87 (AA"BB1; 2H, -pyridyl); 7.50 - 7.43 (m, 2H); 7.19 - 7.10 (m, 2H) ; 4.14 (t; J-7.1Hz, CH2) ; 3.83 (t; J=7.2Hz, CH2) ; - "C"-NMR (d6-DMSO / CDC13) : S[ppm] = 165.3, 164.6, 159.7, 148.5, 142.7, 140.2, 134.6, 131.5, 131.4, 130.5, 127.22, 12 7.15, 122.7, 114.8, 114.4, 47.3, 34.4. Example 12: [5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydro-pyrrolo-[2,1-b]-thiazol-7-yl]methanol The compound of example 10 A (0.37 g, 1.0 mmol) is dissolved in abs. THF (7 ml) at 50°C and kept at 55°C for 7 h with a so¬lution of Na bismethoxyethoxyaluminum hydride in toluene (Vi-trideR, 70% strength, 0.80 ml, 2.8 mmol). After cooling, the excess of hydride is decomposed in an ice bath using a little water and the suspension is stirred until formation of the precipitate is complete. The precipitate is filtered off with suction and washed with water until the reaction of the wash phase is neutral: 0.27 g. Yield: 82%, CiaH15FN2OS, MW = 326.40; lH-NMR (DMS0-d6/ CDC13) : 6[ppm] - 8.76 - 8.55 / 7.59 - 7.55 (AA"BB1; 4H, -pyridyl); 7.51 - 7.44 (m; 2H, ar.); 7.20 - 7.11 (m; 2H, ar.); 4.49 (s; CH2) ; 4.17 (t; J=7.0 Hz, CH2) ; 3.73 (t; J=7.0 Hz, CH2) . Example 13: 5-(4-Fluorophenyl)-7-methyl-6-pyridin-4-yl-2,3-dihydropyrrolo-[2,1-b]-thiazole The compound of example 12 {2.05 g, 6.3 mmol) is brought into solution in a mixture of abs. acetonitrile (16 ml), glacial acetic acid (1.6 ml) and a little abs. DMF at 50°C, sodium io¬dide (2.35 g, 15.7 mmol) is added and then trimethylsilyl chloride (TMSCl, 1.6 ml, 1.37 g, 12.7 mmol) is added dropwise. The temperature of the batch is kept at 50°C for 2 h. Glacial acetic acid (1.6 ml) and zinc powder (2.87 g, 44 mmol) is ad¬ded in three portions and the mixture is stirred at 80°C for 16 h. The mixture is cooled, treated with a little water and extracted with CH2C12. The CH2C12 extracts are dried over Na2S04 sice, and concentrated. The residue obtained is taken up in THF and eluted through A1203 (50 g) using THF. From the residue (1.4 g) obtained after evaporation of the THF, using acetone 0.6 g of pale yellow substance {94%,- HPLC: RP 18; aceto- nitrile/ NaH2P04 buffer 70:30) is obtained, which is recrystal- lized from MeOH in the presence of heat: 0.43 g of pale yellow powder. M.p. 208°C; yield: 23%, C18H15FN2S, MW = 310.4; IR (KBr) : 1/X (cm"1) = 1596, 1557, 1533, 1499, 1420, 1361, 13 03, 122 6, 1158, 10 98, 1053, 98 9, 852, 822, 735, 721, 52 9; - *H-NMR (CDCla) : 5[ppm] = 8.57 (2H, -pyridyl) ; 7.35 - 7.27(m; 4H, - pyridyl and ar.) ,- 7.19 - 7.10 (m; 2H, ar.) ; 4.12 (t; J=7.0 Hz, CH2) ; 3.72 (t; J=7.0 Hz, CH2) ; 2.23 {s; CH3). 13C-NMR (dg-DMSO / CDCl3) : 6[ppm] - 164.6, 159.7, 147.7, 145.2, 132.6, 131.0, 130.8, 129.8, 127.5, 121.4, 119.4, 116.0, 115.6, 113.3, 47.9, 35.3, 12.8. Example 14: 5- (4-Fluorophenyl)-6-pyridin-4-yl-2,3-dihydro-pyrrolo-[2,1-b]-thiazole 5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydropyrrolo-[2,1-b] -thiazole-7-carboxylic acid (example 11, 120 mg, 0.35 mmol) is heated under argon in an oil bath firstly at 140°C for 2 h and then at 180°C for 3 h. After cooling to RT, the brown-red melt cake is digested with a little EtOH. The undissolved, red-brown substance is filtered off with suction, washed with ether and dried: 0.07 g. Yield: 67%, C17H13FN2S, MW = 296.37; ^-NMR (CDC13>: 5[ppm] = 8.46 - 8.43 / 7.64 - 7.61 (AA" BB" ; 4H, -pyridyl); 7.44 - 7.37 (m; 2H, ar.); 7.20 - 7.11 (m; 2H, ar,); 6.67 (S; CH) ; 4.35 (t; J=7 .2 Hz, CH2) ; 3.95 (t; J=7.2 Hz, CH2). Example 15A: Ethyl 3-(4-fluorophenyl)-2 -(4-pyridyl)-5,6,7,8-tetrahydroindolizine-1-carboxylate a) 1-(4-Fluorobenzoyl)piperidine-2-carboxylic acid D, I^-Pipecolic acid (16.15 g, 0.125 mol), dissolved in NaOH (5%, 200 ml, 0.25 mol) is treated dropwise at 5°C (ice-bath cooling) with 4-fluorobenzoyl chloride (19.83 g, 0.125 mol), and the magma forming after 1 h is liquefied using water (50 ml) before further acid chloride addition. The batch is stirred at 10-15°C for 4 h. By addition of water (220 ml), the precipitate formed is al¬most completely brought into solution (pH =8-9) and using ether (160 ml) the radicals of the acid chloride and other neutral impurities are removed. The desired product is deposi¬ted from the alkaline water phase by addition of HC1 (10% strength) until pH 2 is reached. The HCl-acidic suspension is extracted with ether (300 ml) , and the ether phase is separa¬ted off, dried (Na2S04 sicc.) and concentrated in vacuo. The residue (8% 4-fluorobenzoic acid) is crystallized from ether (20 ml): 28.67 g. Yield: 72%, C13H14FN03, MW = 251.3; ^-NMR (CDC13) : 5[ppm] = 8.30 ( br; 1H, OH); 7.50 - 7.35 (m; 2H, ar.); 7.20 - 7.00 (m; 2H, ar.) ; 5.50 (m; 1H, CHXN) ; 4.70 - 4.4 (m; 1H, CHAHB) ; 3.75 - 3.60 (m; 1H, CHAHB) ; 3.35 - 3.15 (m; 1H, CHAHB) ; 2.45 - 2.30 (m; 1H, CHAHB) ; 1.9 - 1.3 (m; 4H, CHAHB) . b) Ethyl 3-(4-fluorophenyl) -2-(4-pyridyl)-5,6,7,8-tetrahydro-indolizine-1-carboxylate 1-(4-Fluorobenzoyl)piperidine-2-carboxylic acid (17.6 g, 0.07 mol) is dissolved in acetic anhydride (45 ml) at 80°C and then ethyl 2-bromo-3-(4-pyridyl)propenoate (22.4 g, 0.087 mol). A strong evolution of C02 is ended after about 10 min. The reaction mixture is kept at 130°C (reflux) for 20 h. After cooling, CH2C12 (100 ml) and water (50 ml) are added and the mixture is vigorously stirred for 10 min, then the phases are separated. The water phase is extracted again with CH2C12 (150 ml), and the combined organic phases are washed un¬til neutral with sat. Na2C03 soln (50 ml), dried (Na2S04 sicc.) and concentrated. 29.26 g of crude product remain. The acidic water phase is alkalized with NaOH, black lumps depositing which are partly soluble in CH2Cl3 (200 ml) and contain resi¬dues of the compound sought. Residue of this CH2C12 phase and crude product fraction are combined (30 g}, taken up in CH2Cl2 (30 ml) and purified by cc on Al203 (2300 g) using ether / THF (9:1): Fractions 4-12: 12.5 g of product 15 A, which crystallizes from diisopropyl ether/n-hexane (10 ml, 1:1). The crystals are filtered off with suction and dried: 9.3 g (36.6%). Yield: 9.3 g (36.6%) C22H21FN202; MW = 364.42. *H-NMR (CDC13) 6[ppm]: 8.39 - 8.36 / 7.04 - 7.02 (AA"BB1; 4H, -pyridyl) ; 7.13 - 6.93 (m; 4H, ar.) ; 4.12 (q; J-7.11 Hz, CH2) ,-3.705 (t; J=3 Hz, CH2) ; 3.21 (t; J=2 Hz, CH2) ; 1.98-1.85 (m, 2 CH2, 4H) ; 1.09 (t; J=7 .1 Hz, CH3) . Example 15B: Ethyl 3 -(4-fluorophenyl)-1-(4-pyridyl)-5,6,7,8-tetrahydroindolizine-2-carboxylate CC purification of the compound from example 15A, b) Separation on A1203- ether /THF 9:1: fractions 13 - 19: 2.35 g of substance 15B. Crystals from diisopropyl ether/n-hexane (1 ml, 1:1): 1.66 g. Yield: 6.6%; C22H21FN202; MW = 364.42. *H-NMR (d6-DMSO) 5[ppm] =: 8.50 - 8.45 (AA" , 2 H, pyridinyl); 7.45 - 7.37 (m, 2H , ar.); 7.30 - 7.15 (m, 4H, ar. + BB" py¬ridinyl); 3.80 {q, 2H, J= 7.0 Hz, 0CH2); 3.65 - 3.55 (m, 2H, CH2 ); 2.75 - 2.65 (m, 2H CH2) ; 1.80 - 1.60 (m, 4H, CH2-CH2) ; 0.757 (t, 3H, J = 7.0 Hz, CH3). 13C-NMR (CDC13) : 5[ppm] = 164.10, 162.09 (d, J = 243.4 Hz), 148.80, 143.29, 135.61, 132.840 (d, J = 8.4 Hz), 128.58, 127.816 (d, J = 3.3 Hz), 124.91, 117.61, 114.91 (d, J = 21.4 Hz), 111.33, 58.96, 44.35, 22.71, 22.34, 19.93, 13.52. Example 16: [3-(4-Fluorophenyl)-2-(4-pyridyl) -5,6,7,8-tetrahydroindolizin-1-yl]methanol The solution of ethyl 3-(4-fluorophenyl)-2-(4-pyridyl)-5,6,7, 8-tetrahydroindolizine-l-carboxylate (example 15 A, 2.55 g, 7 mmol) in abs. THF {15 ml) is treated dropwise under argon at RT with the solution of NaAlH2 (OC2H4OCH3) 2 in toluene (Vitride" 70%, 2.9 ml, 10 mmol) and the batch is stirred at 40°C for 24 h until the complete disappearance of the starting material {tic Al203/ethyl acetate: starting material rf = 0.8; product rf = 0.5). The excess of hydride is destroyed by addi¬tion of water (2 ml), then THF is removed in vacuo and the re¬sidue is taken up in ethyl acetate. The ethyl acetate phase is washed with water until the reaction of the wash phases is neutral (60 ml). The ethyl acetate phase is dried over Na2S04 sice, and concentrated: a residue of 2.15 g remains. Yield: 95%; C20H19FN2O; MW = 322.4. IR (KBr) : 1/X, (cm"1) = 3243, 2946, 1600, 1534, 1511, 1221, 994, 840, 579; - LH-NMR (CDC13) 5[ppm] = 8.40 - 8.37 / 7.15 - 7.12 (AA"BB1; 4H, -pyridyl); 7.17 - 7.12 Cm; 2H, ar.); 7.07 - 6.98 (m; 2H, ar.); 4.55 (a; CH2) ; 3.80 - 3.70 (m; CH2) ; 3.00 - 2.90 (m; CH2) ; 1.95 - 1.90 (m; 4H, CH2) . Example 17: [3-(4-Fluorophenyl)-l-methyl-2-(4-pyridyl)-5,6,7,8-tetrahydroindolizine The mixture of [3-(4-fluorophenyl)-2-(4-pyridyl)-5,6,7,8-tetrahydroindolizin-1-yl]methanol (example 16, 3.52 g, 11 mmol) with hydriodic acid (57%, 20 ml, 0.15 mol) is heated to 100"C and the course of the reaction is checked by tic (A1203, ether). After 45 min, starting material (rf = 0.2) is no longer detectable (product: rf = 0.7). The cooled reaction mixture is treated with ethyl acetate (100 ml), extracted by shaking with sat. Na2C03 solution and decolorized using Na2S203 solution and then washed with water. The ethyl acetate phase is dried over Na2S04 sice, and concen¬trated. The residue is purified by cc (A1203, ether/THF 9:1): fraction 4-11 yields 1.6 g of product, which crystallizes from diisopropyl ether: 1.02 g Yield: 30.4%; C20Hi9FNa; MW = 306.4. JH-NMR (CDC13) S[ppm] = 8.40 - 8.36 / 7.00 - 6.97 {AA ■ BB • , 4H, -pyridyl); 7.18-7.11 (m; 2H, ar.); 7.04 - 6.96 {m; 2H, ar.}; 3.75 - 3.70 (m; CH2); 2.83 - 2.78 (m; CH2) ; 2.08 (s; 3H, CH3) ; 1.95 - 1.85 (m; 4H, CH2~CH2); - 13C-NMR (CDCI3) : 5[ppm] = 164.5, 159.6, 149.1, 144.5, 132.6, 132.4, 128.6, 128.2, 128.1, 126.9, 124.6, 119.9, 115.7, 115.3, 11.9, 44.4, 23.8, 22.0, 20.9. Example 18: 3-(4-Fluorophenyl)-2-(4-pyridyl)-5,6,7,8-tetra-hydro i ndoli z ine Ethyl 3-(4-fluorophenyl)-2-(4-pyridyl)-5,6,7,8-tetrahydro-indolizine-1-carboxylate (example 15A, 2.92 g, 8 mmol) and hy-driodic acid (57%, 16.0 ml, 27 g, 120 mmol) are mixed at 60°C and maintained at a temperature of 120°C. The initially depo¬sited hydriodide dissolves again in the presence of heat (10 min). The course of the reaction is checked by tic (AI2O3, ether/THF 9:1). After 30 min, the conversion is complete (starting material rf = 0.6,- product rf = 0.8). The mixture is cooled in an ice bath. The precipitate of the crystallized hydriodide formed is fil¬tered off with suction, purified of adherent HI by washing with water {6 times 5 ml) and dried in vacuo (desiccator, P205) . 2.68 g (79.5%) of hydriodide are isolated. The mother liquor of the crystallization is neutralized using NaOH and extracted with ethyl acetate. The ethyl acetate phase is decolorized using Na2S203 solution and then washed with wa¬ter. The ethyl acetate phase is dried over Na2S04 sice, and concentrated: 0.44 g of product (base). Isolation of the base: 5-(4-Fluorophenyl)-6-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine hydriodide (2.68 g, 9.2 mmol) is suspended in CH2C12 (150 ml) and intensively stirred with saturated NaHC03 solution (40 ml). The CH2C12 phase is then separated off, dried using Na2S04 sice, and concentrated in vacuo to a small volume (5 ml). The cry- sta-la formed are washed with diisopropyl ether and dried: 1.66 g- Yield: 72.2%, Ci9H17FN2; MW = 292.36 ^-NMR (CDC13) 6[ppm] = 8.32 - 8.29 / 7.01 - 6.98 ( AA"BB", 4H, -pyridyl); 7.30 - 7.21 (m; 2H, ar.); 7.16 - 7.06 (m; 2H, ar.); 6.21(s; 1H) ; 3.70 - 3 . 64 (m, CH2) ; 2.91 - 2.85 (m; CH2) ; 1-98 - 1.80 (m; 4H, CH2-CH2) ; - 13C-NMR (CDCI3) : 5[ppm] = 165.0, 160.1, 149.3, 144.2, 132.8, 132.6, 13 0.4, 126.1, 128.5, 128.4, 121.6, 119.2, 116.1, 115.7, 104.2, 44.3, 23.6, 23.4, 20.9. Example 19A: Ethyl 2 -(4-fluorophenyl)-3 -(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-l-carboxyIate a) Benzyl 1-(pyridine-4-carbonyl)pyrrolidine-2-carboxylate L-Proline benzyl ester hydrochloride (2.42 g, 0.01 mol) dis¬solved in pyridine (80 ml) is treated in portions at 3°C (ice-bath cooling) with isonicotinoyl chloride hydrochloride (1.78 g, 0.01 mol), the IT increasing to 10DC. After removing the ice bath, the mixture is stirred for 5 h, the batch turning greenish. Excess pyridine is removed on a Rotavapor and the residue ob¬tained is partitioned between water (40 ml) and ether. After separating off the ether phase, the water phase is extracted with ether (60 ml). The ether phases are collected, washed with water (20 ml), dried (Na2S04 sice.) and concentrated in vacuo. The residue is dried in a high vacuum: 2.96 g. Yield: 85%, CiaH1BN203, MW = 310.36; Hl-NMR (CDCI3) : S[ppm] =* 8.72 - 8.69 / 7.43 - 7.40 {AA"BB", 4H, -pyridyl); 7.37 (s; 5H); 5.260 / 5.188 ( AB, JRB = 12.3 Hz, OCH2Ph); 4.765 - 4.695 (m, CHX, 1H); 3.610 - 3.395 {m, 2H, CHAHB) ; 2.140 - 1.875 b) 1-(Pyridine-4-carbonyl)pyrrolidine-2-carboxylic acid Benzyl 1-(pyridine-4-carbonyl)pyrrolidine-2-carboxylate (4.0 g, 11.5 mmol) is dissolved at RT in a mixture of THF and ethanol abs. (1:1, 30 ml), and treated with palladium on acti¬ve carbon (10%, 0.7 g). Evacuation is then carried out three times and the vacuum is replaced by hydrogen from a balloon. The mixture we hydrogenated at atm and RT for 16 h. After this, the reaction mixture no longer contains starting materi¬al (tic A1203 / n-hexane ethyl acetate (1:1); starting materi¬al: rf = 0.2-0.4 and product: rf = 0.0) . The product solution is removed from the catalyst (G4), con¬centrated in vacuo and dried in a high vacuum, 2.95 g (>100%) , content according to gc about 60% strength. c) Ethyl 2-bromo-3-(4-fluorophenyl)propenoate With exclusion of light, bromocarbethoxymethylenetriphenyl-phosporane (example 1A, b; 9.0 g, 21 mmol) is brought into so¬lution in toluene (60 ml) and and the solution of 4-fluoro-benzaldehyde (2.48 g, 20 mmol) in toluene (9 ml) is then ad¬ded. The solution is stirred at RT for 16 h in the dark, con¬centrated in vacuo, the residue is treated with ether (40 ml) and the crystals deposited in the course of this are washed with ether (2x10 ml). The collected ether solutions are concentrated in vacuo and the residue which remains (7.82 g) is treated with an ether/n-hexane mixture (1:1, 5 ml). Precipitate remaining undissolved during this is separated off and washed with ether/n-hexane mixture (1:1). On concentrating, 6.06 g of the residue still remain here which are purified by cc (Si02, ether/n-hexane 1:1): The substance sought appears in the fractions 1-2: yel¬low-brown oil, 4.72 g. Yield: 99.6%; CnHiaBrF02; MW = 273.10.; - IR (NaCl) : 1/X (crrf1) = 2983, 1724, 1601, 1508, 1261, 1235, 1195, 1161, 1040, 833; - *H-NMR (CDC13:) 5[ppm] = 8.18 (s; 1H) ; 7.91 - 7.84 (m, 2H, ar.); 7.16 - 7.07 {m; 2H, ar.) 4.36 (q; J=7.2Hz, CH2) ; 1.38 (t; J=7.1Hz, CH3) ; - 13C-NMR {CDC13:) 5[ppm] = 163.4 (d, J = 250 Hz), 163.2, 139.4, 138.7, 132.4 d) Ethyl 2-(4-fluorophenyl)-3-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate A mixture of 1-(pyridine-4-carbonyl)pyrrolidine-2-carboxylic acid (example 19A, b; 60%, 1.5 g, 4.1 mmol), ethyl 2-bromo-3-(4-fluorophenyl)propenoate (example 19A, c; 1.0 g, 4 mmol) and acetic anhydride (10 ml) are heated under reflux for 21 h in an oil bath maintained at a temperature of 150°C. After coo¬ling and concentrating in vacuo (Rotavapor), needles deposit. The concentrated crystal suspension is treated with ether/ethyl acetate (1:2) and the crystals are filtered off with suction. The mother liquor is completely concentrated and the residue is purified by cc (Al203- ether /THF 9:1): Fractions 3-5: product 19 A, which crystallizes from ether. The crystals are filtered off with suction and dried: 0-12 g. Yield: 8.5%, C21Hi9FN202,- MW - 350.4. Hl-NMR (CDCI3) 5[ppra] = 8.45 - 8.42 / 6.97 - 6.94 (AA"BB1; 4H, -pyridyl); 7.23 - 7.15 / 7.02 - 6.93 (AA"BB1; 4H, ar.); 4.20 -4.09 (q, CH20; + t, CH2, 4H) ; 3.23 (t; J=7.5Hz, 2H) ; 2.58 (quin; J=7.2Hz, 2H, CH2); 1.18 (t; J=7.1Hz, CH3) Example 19B: Ethyl 1-(4-fluorophenyl)-3 -(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-2-carboxylate CC purification of the compound from example 19A, d) Separation on Al203-ether /THF 9:1: fractions 7-20, crystals from ether: 0.05 g. Yield: 3%; C2iHi9FN202; MW = 350.4. ^-NMR (CDCI3) 5[ppm] = 8.67 - 8.64 / 7.40-7.37 (AA"BB1; 4H, py¬ridyl); 7.39-7.32 / 6.98- 6.93 (m; 4H, ar.); 3.97 (t; 2H, J=7.1 Hz); 2.94 (t; 2H, J=7.2HZ); 2.62 - 2.48 (m; 2H); 0.975 (t; J=7.1Hz, CH3) . Example 20: [2-(4-Fluorophenyl)-3-(4-pyridyl)-6,7-dihydro-5H-pyrrolizin-1-yl]methanol Ethyl 2-(4-fluorophenyl)-3-(4-pyridyl)-6,7-dihydro-5H-pyrrolizine-1-carboxylate (example 19A, 0.15 g, 0.43 mmol) is dissolved under argon in abs. THF (4 ml) and sodium dihydrido-bis(2-methoxy-ethoxy)aluminate solution {Vitride R, 70% in to¬luene, 0.9 ml, 4.5 mmol) is added dropwise in 4 portions at 40°C with exclusion of moisture at in each case an interval of 1 hour. 1 h after the last addition, starting material can no longer be detected by tic (A1203 - ethyl acetate/n-hexane 3:7). After this, the mixture is allowed to cool. The reaction solu¬tion is partitioned between water (20 ml) and ethyl acetate (20 ml) and the water phase is neu¬tralized to pH 6-7 by means of HC1 (3%). The phases are sepa¬rated and the water phase is extracted 3 times by shaking with ethyl acetate (20 ml). The combined organic phase is dried over Na2S04 sice and concentrated in vacuo: 0.21 g. Yield: > 100%; Ci9H17FN20; MW = 308.36. lH-NMR (CDC13) : 5[ppm] = 8.41 - 8.38 / 7.05 - 7.01 (AA"BB"; 4H, -pyridyl); 7.26 - 7.20 (m; 2H, ar.); 7.04 - 6.97 (m; 2H, ar.); 4.47 (s; CH20) ; 4.12 (t; J=7.0 Hz, CH2N) ; 3.01 (t; J=7.3 Hz, CH2) ; 2.57 (quin; J=7.5 Hz, 2H, CH2) . Example 21: 6-(4-Fluorophenyl)-7-methyl-5-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine a) 2-Ethyl-1-pyrroline Sodium hydride (60% in paraffin, 36 g, 0.9 mol) in abs. THF (180 ml) is suspended in a 1 1 3-necked flask having a drop¬ping funnel and reflux condenser and the suspension is heated with gentle refluxing for 10 min. The mixture of ethyl propio¬nate (33.7 g, 0.33 mol) and 1-vinyl-2-pyrrolidone (33.34 g, 0.3 mol) in abs. THF (35 ml) are added dropwise to the boiling suspension (10 min) and kept under reflux by hea¬ting for 3.5 h with stirring. After cooling to 10°C (ice bath) the excess of sodium hydride is destroyed and neutralized using sat. ammonium chloride so¬lution (300 ml) {beware! H2) and to drive off the ammonia libe¬rated the now warm mixture (30°C) is intensively stirred for a further 10 min. The deposited THF phase is separated off, dried over Na2S04 sice, and concentrated. The paraffin layer depositing on the oil phase is decanted. The red, oily product fraction obtained (3-propionyl-l-vinyl-2-pyrrolidone, 51.2 g, about 92%) is used without further purification for the prepa¬ration of 2-ethyl-l-pyrroline: B.p.=14Q.20°C (760 torr) , yield: 102%, C9Hi3N02, MW = 167.21. IR (NaCl) : 1/X {cm"1) = 2955, 2925, 2854, 1698, 1633, 1456, 1427, 1387, 132 7, 1273, 1114, 979; - 1HNMR (CDC13) : d (ppm) = 7.08 - 6.95 (CH) ; 4.52 - 4.42 (CH2); 3.74 - 3.67 (CH) ; 3.60 - 3.41 (CH2) ; 3.13 - 2.96 (CH) ; 2.69 -2.51 (CH2) ; 2.23 - 2.09 (CH) ; 1.08 (t, J = 7 Hz, CH3) . 13CNMR (CDCI3) : d (ppm) = 205.3 (C=0) , 168.4 (C=0) , 129.1 (C-H) , 95.6 (CH2) , 55.2 (C-H) , 43.1 (CH2) , 35.9 (CH2) , 19.3 (CH2) , 7.3 {CH3) HC1 (20%, 300 ml) is heated to gentle boiling in a 3-necked flask having a dropping funnel and water separator with reflux condenser. A solution of the crude 3-propionyl-l-vinyl-2-pyrrolidone (40.4 g, 240 mmol) in THF (60 ml) is added dropwi¬se from the dropping funnel {10 min) and the batch mixture is kept at 100°C (IT). The acetaldehyde/THF mixture (47 ml) col¬lected in the water separator is discarded. The mixture is kept at this temperature for 6 h, cooled and extracted with ether (200 ml). The 2-ethyl-l-pyrroline is deposited from the HCl-acidic water phase by alkalization to pH 9-10 in the cold (5-10°C). The deposited oil is taken up in diethyl ether {150 ml) and the water phase is extracted with diethyl ether {300 ml). The ether phases are combined, dried (K2C03) and concen- trated in a weak vacuum (240 mmHg, 45°C). 18.4 g of 2-ethyl-1-pyrroline are obtained as a yellow-colored oil (about 94%). B.p.=109.5 (760 mmHg); yield: 79%, CfiHuN, MW = 97.16. IR (NaCl) : 1A (cm"1) 3378, 2969, 2937, 2870, 1644, 1462, 1454, 1431, 13 71, 13 00, 1144, 10 93, 1019, 961; - iHNMR (CDC13) : d (ppm) = 3.38 - 3.76 (m; CH2) ; 2.52 - 2.34 {m; 2 CH2) ; 1.89 (quin.; CH2, J=7 .8 Hz); 1.15 (t; CH3, J=7.6Hz); 13CNMR (CDCI3) : d (ppm) = 179.8, 60.5, 36.9, 26.8, 22.4, 10.6. b) 6-(4-Fluorophenyl)-7-methyl-2,3-dihydro-lH-pyrrolizine 2-Bromo-l-(4-fluorophenyl)-1-ethanone (19.53 g, 90 mmol} is added to the oily ethyl-1-pyrroline (17.55 g, 180 mmol) in portions in a 500 ml flask, the exothermically reacting mixtu¬re cooling between the additions. The mixture of the reaction components is heated in an oil bath (100°C) with stirring {30 min). The course of the reaction is monitored by tic. The cooled mixture is treated with CH2Cl2 {250 ml) and deposi¬ted salts are washed out in a separating funnel using two por¬tions of HCl (3%, 40 ml). The CH2C12 phase is washed with water (50 ml), dried {Na2S04 sice.) and concentrated. As a residue, 14.04 g of 6-(4-fluorophenyl)-7-methyl-2,3 -dihydro-lH-pyrrolizine remain as a brown viscous oil (about 90%) . Yield: 72%; C14H14FN, MW = 215.27. 1HNMR (CDCI3) : d (ppm) = 7.39 - 7.30 {m, 2H, F-ar.); 7.08 -6.98 (m, 2H, F-ar.); 6.67 (s, 1H, 5-H); 3.954 (t; 2H, CH2, J= 7 Hz); 2.801 (t; 2H, CH2, J=7 Hz); 2.487 (quin.; CH2, J=7 Hz); 2.125 {s; 3H, CH3) ; 13CNMR (CDC13) : d (ppm) = 161.04 (d, C-F, J=242 Hz), 135.58 (d, J=2.0 Hz), 133.51 (d, J=2 Hz), 128.87 {d, J = 7.5 Hz); 127.65; 115.025 {d, J = 20.9 Hz); 111.11 (pyrrole-C-H); 106.71; 46.47; 27.44; 23.14; 10.86. c) Ethyl 4-[2-(4-fluorophenyl)-l-methyl-6,7-dihydro-5H- pyrrolizin-3-yl]-4H-pyridine-l-carboxylate The solution of 6-(4-fluorophenyl)-7-methyl-2,3-dihydro-lH-pyrrolizine (1.72 g, 8.0 mmol) in CH2C12 (55 ml) is firstly treated at 0°C (ice bath) with pyridine (1.6 ml, 1.58 g, 20 mmol) and dropwise with the solution of ethyl chloroformate (2.1 g, 19.5 mmol) in CH2Cl2 (25 ml) (10 min). After a tempera¬ture rise to 3-6°C, the cooling agent is removed and the mix¬ture is stirred for 1 h at RT, then heated to boiling tempera¬ture (36°C) for 15 min. Then and after refluxing for a further hour, in each case 2 further portions of pyridine (each 0.8 ml, 10 mmol) and chloroformic acid (each 1.05 g, 10 mmol) are added dropwise and after a total of 3 h the reac¬tion is terminated. The dark-colored batch solution is poured onto ice water (100 ml), stirred for 15 min and then the pha¬ses are separated. The water phase is extracted with CH2CI2 (100 ml) and the combined organic phase is washed with water (50 ml), dried (Na2S04 sice.) and concentrated. As a residue, 2.69 g of dark oil (91.9% crude) remain which still contains residues of unreacted 6-(4-fluorophenyl)-7-methyl-2,3-dihydro-lH-pyrrolizine and was employed without further purification in the next stage. Yield: 91%; C22H23FN2O2; MW = 366.44. d) 6-(4-Fluorophenyl)-7-methyl-5-(4-pyridyl)-2 , 3-dihydro-lH- pyrrolizine Potassium tert-butoxide (3.36 g, 30 mmol) is added to the so¬lution of the dihydropyridine compound from example 21,c (1.83 g, 5 mmol) in tert-butanol (30 ml) obtained at RT, and the mixture is firstly intensively stirred with admittance of air for 1 h at RT, then under reflux for 1 h. The solution is con¬centrated, and the residue is taken up with water (40 ml) and extracted with ethyl acetate (100 ml). The ethyl acetate phase is washed with water {20 ml), dried (Ha2S04 sice.) and concen- trated. The attempt to crystallize this residue {1.03 g) from ether (3 ml) was not successful. The purification of the substance was carried out by cc (Al203, ether): The residue obtained from fractions 33-42 crystallizes from ether: 0.14 g. Yield: 10%; Ci9H17FN2; MW = 292.36 Hi-NMR (CDC13) 8[ppm] = 8.40 - 8.37 / 7.00-6.97 (AA"BB"; 4H, - pyridyl}; 7.20 - 7.11 {m; 2H, ar.),- 7.06 - 6.96 (m; 2H, ar.); 4.10 (t; J=7.0 Hz, CH2); 2.885 (t; J=9.4 Hz, CH2); 2.54 (quin; J=7.1 Hz, CH2) , 1.99 (s; CH3)- Example 22: 6-(4-Fluorophenyl)-5-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine a) l-Fluoro-4-(2-nitrovinyl)benzene The mixture of 4-fluorobenzaldehyde (12.4 g, 0.1 mol), anhy¬drous ammonium acetate (7.8 g, 0.101 mol) and nitromethane (8.1 ml, 9.15 g, 0.15 mol) in glacial acetic acid (68 ml) are heated to reflux (110°C) for 3.5 h. The cooled mixture is treated with ice water (80 ml), whereupon brown needles cry¬stallize out. After placing in the cold in an ice bath for 30 min, the crystals are filtered off with suction, washed with water (60 ml) and dried for 16 h in vacuo (desiccator) over P205: 13.2 g (81.8%) . The crystals are recrystallized from acetic acid (50%, 130 ml) in the presence of heat: the slightly pale green crystals cry¬stallizing in the cold (2 fractions) are washed with water (60 ml) and dried as above: 9.76 g, and 1.0 9 g. Yield: 67% (10.8 g) , CaHsFN02; MW = 167.14 IR (KBr) : 1A (cm-1) = 3111, 1637, 1595, 1501, 1341, 1230, 1164, 965, 827, 515; - Hl-NMR (CDCI3) : 5[ppm] = 8.02 - 7.96 (d, 1H, J=13.7Hz, -CbH=CHaN02) ; 7.60-7.50 (m, 3H, ar. + -CbH=CHaN02) ,- 7.20 - 7.11 (t, 2H, J=8.5Hz, ar.). b) 6-(4-Fluorophenyl)-5-(4-pyridyl)-2,3-dihydro-lH-pyrrolizine 1-(Pyridine-4-carbonyl)pyrrolidine-2-carboxylic acid (example 19A, b; 60%, 2.0 g, 5.5 mmol) dissolved at 80°C in acetic an¬hydride (16 ml) is treated with 1-fluoro-4-(2-nitrovinyl)-benzene (1.32 g, 7.9 mmol) and heated to 130°C (IT). At 110°C begins the release of N02 and C02, which is complete after 60 min. After a total of 2 h at 110-130°C, the batch is allo¬wed to cool and to stand at RT for 16 h. The mixture is partitioned between water (70 ml) and ethyl acetate (50 ml), the organic phase is separated off, the H20 phase is extracted with ethyl acetate (100 ml) and the com¬bined ethyl acetate phase is dried (Na2SC>4 sice.) and concen¬trated. The isolation of the product was carried out by means of CC (Al203, ether): fractions 17 - 60, (rf = 0.5): residue crystal¬lizes from diisopropyl ether, 0.32 g (needles, 2nd crystal¬lization fraction from the mother liquor 0.1 g). Yield: 16.6% (0.32 g) , C1BHi5FN2; MW = 278.33 IR (KBr) : lA (cm-1) = 3111, 1637, 1595, 1501, 1341, 1230, 1164, 965, 827, 515; - ^-NMR (CDCI3) 5[ppm] - 8.49 - 8.45 / 7.13 - 7.10 (AA" BB" ; 4H, -pyridyl) ; 7.25 - 7.17 (m,- 2H, ar. ) ; 6.99 - 6.90 (m; 2H, ar.); 6.03 (s; H, pyrrolizine-C5-H) ; 4.06 (t; J=7.0Hz, CH2) ; 2.95 (t; J-7.3HZ, CH2) ; 2.54 ( quin; J=7.2Hz, CH2) ; - 13C-NMR (CDCI3) : 5[ppm] = 164.0, 159.2, 150.0 140.6, 139.6, 132.8, 132.7, 130.1, 13 0.0, 128.3, 122.8, 115.6, 115.2, 120.1, 46.9, 27.5, 24.5. Example 23: 7-(4-Fluorophenyl)-3,3-dimethyl-8-pyridin-4-yl-3,4-dihydro-2H-pyrrolo[2,1-b] [1,3]thiazine a) 4-(4-Fluorophenyl)-3-pyridin-4-yl-5H-furan-2-one A solution of K tert-butoxide (33.7 g, 0.3 mmol) in MeOH (22-0 ml) , which is prepared with ice cooling, is added dropwi-se to a suspension of 4-pyridylacetic acid hydrochloride (25.9 g, 0.15 mol) in anhydrous MeOH (150 ml). After stirring at RT for 1 h, the methanol is distilled off in vacuo and the resi¬due of the potassium salts is taken up in DMF abs. (250 ml). 2-Bromo-l-(4-fluorophenyl)ethanone (23.9 g, 0.11 mol) is stirred in in portions (5 g) and stirring of the mix¬ture is continued at RT for 2 h. After this, it is poured onto water {1.5 1) and extracted by stirring with CHC13 (250 ml) for 30 min and the CHC13 phase is separated off in a separating funnel. The water phase separated off is extracted with CHC13 (300 ml) , and the combined CHC13 extracts are washed with water (200 ml), dried over Na2S04 sice, and concentrated. The dark-green semicrystalline residue is digested with EtOH (50 ml), and the crystals are filtered off with suction, washed with EtOH (20 ml) and dried: 18.8 g of yellow-green crystals. M.p. 157.0°C; yield: 50%, C15H10FNO2; MW = 255.25; IR (KBr) : lM (cm"1} = 1746, 1647, 1602, 1509, 1233, 1161, 1037, 827, 839; - XH-NMR (CDCI3) : 5[ppm] =8.68-8.64 (m, 2H, AA" pyridyl . ) ; 7.38 - 7.26 (m, 4H, BB" pyridyl. + F-ar.); 7.14 - 7.05 (m, 2H, F-ar. ) ; 5 . 19 (s, 2H, CH2) ; - b) 4-(4-Fluorophenyl)-1-(3-hydroxy-2,2-dimethyl-propyl)-3-pyridin-4-yl-l,5-dihydropyrrol-2-one Equimolar amounts of neopentanolamine (3-hydroxy-2,2-dimethyl-propylamine, 36.3 g, 0.35 mol) and glacial acetic acid (21.0 g, 0.35 mol) are homogeneously mixed with evolution of heat and the still warm mixture is heated to 105°C (IT) by lo¬wering it into a temperature-controlled oil bath. 4-(4-Fluorophenyl)-3-pyridin-4-yl-5H-furan-2-one (17.8 g, 0.07 mol) is stirred into this neopentanolammonium acetate melt in 4 portions {15 min) and the reaction mixture is heated for a further 1.5 h. The cooled reaction mixture is treated with sat. NaHC03 solution and ethyl acetate (50 ml) and intensively stirred (30 min). The crystals deposited are filtered off with suction, washed with ethyl acetate and dried in vacuo: 12.3 g. Yield: 52%, C20H2iFN2O2; MW = 340.40 IR (KBr) : 1A (cm"1) = 3410, 1662, 1598, 1506, 1381, 1228, 1049, 831; - ^-NMR (CDC13) 5[ppm] = 8.63 - 8.59 (m, 2H, AA" pyridyl. ) ; 7.351 - 7.225 (m, 4H, BB" pyridyl. + F-ar.); 7.085 - 6.995 (m, 2H, F-ar.); 4.44 (s, 2H, C-5-CH2) ; 3.40 (s, 2H, CH20H) ; 3.27 (br, 2H, CH2N) ; 1.88 (br, OH), 1.00 (s, 6H, CH3) . c) 7-(4-Fluorophenyl)-3,3-dimethyl-8-pyridin-4-yl-3,4-dihydro-2H-pyrrolo[2,l-b] [1,3]-thiazine 4-(4-Fluorophenyl)-1-(3-hydroxy-2,2-dimethylpropyl)-3-pyridin-4-yl-l,5-dihydropyrrol-2-one (5.1 g, 15 mmol) and phosphorus pentasulfide (P2S5, 2.5 g, 11.2 mmol) are intimately triturated and the trituration is then heated at 210°C under argon in an oil bath for 3 h. The solidified glassy mass is dissolved in ethyl acetate (40 ml) and NaOH (10%, 40 ml). The ethyl acetate phase is separated off, washed with water, dried (Na2S04 sicc.) and concentrated. The residue (3.8 g) is purified by cc (Si02/ethyl acetate): The residue obtained from fraction 2 (rf = 0.9) crystallizes from diisopropyl ether: 0.6 g. Yield: 11.8%, C20H19FN2S; MW = 338.45 IR (KBr): 1/X (cm"1) = 3432, 1964, 1597, 1535, 1498, 1385, 1212, 1164, 991, 84 0, 816, 591, 517; - :H-NMR (CDCI3) 5[ppm] = 8.465 - 8.430 (m, 2H, AA" pyridyl.),-7.262 - 7.05 (m, 4H, BB" pyridyl. + F-ar.); 7.00 - 6.935 (m, 2H, F-ar.); 6.71 (s, 1H, CB>); 3.70 (s, 2H, CHa); 2.80 (s, 2H, CH2) ; 1.22 (s, 6H, C(CH3)2); - GC-MS (EI, 70 eV): m/z (rel Int. [%]) = 340 (9), 339 (28), 338 (100), 282 (8), 281 (30). Example 24: 7-(4-Fluorophenyl)-3,3-dimethyl-8-pyridin-4-yl-3,4-dihydro-2H-pyrrolo [2,1-b] [1,3]-oxazine 4-(4-Fluorophenyl)-1-(3-hydroxy-2,2-dimethylpropyl)-3-pyridin-4-yl-l,5-dihydropyrrol-2-one (example 23, b; 2.55 g, 7.5 mmol) dissolved in CH2Cl2 (30 ml) is treated with pyridine (2.82 g, 35.6 mmol) and then dropwise with methanesulfonyl chloride (3.84 g, 33.8 mmol) and the mixture is stirred at RT for 16 h. Water (20 ml) is added and after stirring for 15 min the pha¬ses are separated in a separating funnel. The CH2C12 phase is firstly washed until neutral with sat. NaHC03 soln (10 ml), dried over Na2S04 sice, and concentrated. The residue obtained (1.9 g, 51%) of the dimethanesulfonate (+ monomethane-sulfonate) is taken up in methanolic KOH (25 ml, 2N) and hea¬ted to reflux under argon for 16 h. After this, it is diluted with semisaturated sodium chloride solution {150 ml) and ex¬tracted with ethyl acetate. The ethyl acetate extracts are dried over Na2S04 sice, and concentrated. The residue (0.8 g) is crystallized from diisopropyl ether, and the cry¬stals are filtered off with suction and dried in vacuo: 0.3 g of crystals. M.p. 173.0°C, yield: 12.4%, C20H19FN2O; MW = 322.39 IR (KBr) : 1A (cm"1) = 2962, 2870, 1599, 1549, 1505, 1389, 1217, 1142, 10 06, 992, 823, 835, 809, 580; -JH-NMR (CDC13) 5[ppm] = 8.371 - 8.340 (m, 2H, AA" pyridyl.); 7.262 - 7.10 (m, 4H, BB" pyridyl. + F-ar.); 7.05 - 6.90 (m, 2H, F-ar.); 6.19 (s, 1H, CH=) ; 3.95 (s, 2H, CH2) ; 3.71 (s, 2H, CH2) ; 1.185 (s, 6H, C(CH3)2); -GC-MS (70 eV) m/e=322(100%); 293(>10%), 238. WE CLAIM: ,1. A 4-pyridyl- or 2,4-pyrimidinyl-substituted pyrrole derivative and its use in pharmacy, of the formula i in which one of the radicals R1, R2 and R3 is 4-pyridyl, 2,4-pyrimidyl or 3-amino-2,4-pyrimidyl, which is optionally sub¬stituted by one or two Ci-C4-alkyl groups or halogen atoms, the second of the radicals R1, R2 and R3 is phenyl or thienyl, which is optionally substituted by one or two Ci-C4-allcyl groups or halogen atoms, and the third of the radicals R1, R2 and R3 is H, C02H, C02C1-C6-alkyl, CH2OH or C1-C6-alkyl, R4 and R5 independently of one another are H or C1-C6-alkyl; X is CH2, S or 0 and n is 1 or 2, and the optical isomers, physiologically tolerable salts and physiologically easily hydrolyzable esters thereof. 2. A compound of the formula I as claimed in claim 1, where the second of the radicals R1, R2 and R3 is fluorine- or chlorine-substituted phenyl or thienyl. 3. A compound of the formula I as claimed in claim 1, where the second of the radicals R1, R2 and R3 is 4-fluorophenyl or 5-chlorothien-2-yl. 4. A compound of the formula I as claimed in one of the pre¬ceding claims, where the third of the radicals R1, R2 and R3 is C02H. 5. A compound of the formula I as claimed in claim 1, in which the variables have the following meanings: together with pharmaceutically acceptable vehicles and/or additives.

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