|Title of Invention||
"4-HEPTEN-2-YL SALICYLATE AND ITS USE AS FRAGRANCE INGREDIENT"
|Abstract||A compound selected from (Z)-4-hepten-2-yl salicylate|
|Full Text||4-HEPTEN-2-YL SALICYLATE AND ITS USE AS FRAGRANCE INGREDIENT
The present invention refers to 4-hepten-2-yl salicylate, a method of its production and fragrance composition comprising it.
A multiplicity of salicylate esters is known from literature, some of which are used in the fragrance industry. Nevertheless, there is a constant demand in the fragrance industry for new compounds that enhance or improve on odor notes, or impart new odor notes. In particular there is an ongoing demand for long-lasting, powerful floral notes.
A widely-used salicylate ester is, for example, cis-3-hexenyl salicylate ((Z)-3-hexen-1-yl salicylate). It has been identified in carnation flower absolute and is described as possessing a sweet, green balsamic odor note.
Surprisingly, we found that the substitution of cis-3-hexenyl salicylate with a methyl group in the alpha-position to the ester group, giving 4-hepten-2-yl salicylate, has only a slight influence on the odor threshold value, whereas there is a tremendous impairment of the odor threshold value if cis-3-hexenyl salicylate is substituted by a the methyl group in beta-position to the ester, thus making 4-hepten-2-yl salicylate very useful as an substitute for the non-substituted compound. The new molecule as herein described is very valuable for the fragrance industry because of its olfactory characteristics, ist very low odor threshold value and also because of its ability to disperse very quickly throughout a room combined with a lingering effect.
As used herein "odor threshold value" means the lowest concentration of a vapor in the air which can be detected by smell. Generally speaking, it can be said that a compound with a low odor threshold value is more powerful than a compound with a high odor threshold value and thus allows the use of a very low concentration in a fragrance composition to achieve an olfactory effect.
Accordingly the present invention refers in one aspect to the use of 4-hepten-2-yl salicylate, both (Z)-4-hepten-2-yl salicylate and (E)-4-hepten-2-yl salicylate, as a fragrance ingredient.
4-Hepten-2-yl salicylate comprises one chiral centre and as such may exist as a mixture of stereoisomers, or they may be resolved as isomerically pure forms. Resolving stereoisomers adds to the complexity of manufacture and purification of these compounds, and so it is preferred to use the compounds as mixtures of their stereoisomers simply for economic reasons. However, if it is desired to prepare individual stereoisomers, this may be achieved according to methods known in the art, e.g. preparative HPLC and GC or by stereoselective synthesis.
The most desirable isomer is the (Z)-4-hepten-2-yl salicylate, which is characterized by a very crisp floral and green note reminiscent of aspects of certain lily species and frangipani. Both enantiomers have similar odor qualities, whereas the odor threshold of the (Z)-isomer is about 10 times lower than the one of the (E)-isomer, and is thus preferred.
Based on the olfactory properties of the (Z)-4-hepten-2-yl salicylate, as single isomer or in combination with the (E)-isomer, it can be used for the creation of a very broad spectrum of fragrances in combination with the broad spectrum of known fragrance ingredients, which may be selected from the extensive range of natural products and synthetic molecules currently available, such as essential oils, alcohols, aldehydes and ketones, ethers and acetals, esters and lactones, macrocycles and heterocycles. Thus, in fragrance compositions with so-called white-floral notes, it contributes or supports, respectively, aspects characteristic for lily and frangipani species and makes the composition fresher and more sparkling; in aromatic spicy-floral fragrances it may impart a desirable note of wild carnations and contribute again a sparkling freshness; added to an ionone-rich fragrance of the violet and freesia type, it makes the entire composition again very sparkling and refreshing and supports an unique floral green note. Quite generally it can be said that (Z)-4-hepten-2-yl salicylate is a powerful odorant with a remarkably low threshold value and, therefore, effects may already be obtained at dosages of 0.05 weight % based on the fragrance composition. On the other hand, this odorant is characterized by a very high integration capability and can be used at concentrations over 50 weight %.
The compound of the present invention may be employed into fragrance applications, such as perfumes, household products, laundry products, body care products and cosmetics, simply by directly mixing a fragrance composition comprising the compound
with the fragrance application, or the compound may, in an earlier step be entrapped with an entrapment material such as polymers, capsules, microcapsules and nanocapsules, liposomes, film formers, absorbents such as carbon or zeolites, cyclic oligosaccharides and mixtures thereof, or they may be chemically bonded to substrates, which are adapted to release the fragrance molecule upon application of an external stimulus such as light, enzyme, or the like, and then mixed with the application.
Thus, the invention additionally provides a method of manufacturing a fragrance application, comprising the incorporation therein of 4-hepten-2-yl salicylate as a fragrance ingredient, either by directly admixing the compound to the application or by admixing a fragrance composition comprising the compound , which may then be mixed to a fragrance application, using conventional techniques and methods. By the addition of an olfactory effective amount of a compound of the present invention, the odor notes of a fragrance application will be improved, enhanced or modified.
Thus, the invention furthermore provides a method for improving, enhancing or modifying a fragrance application by the addition thereto of an olfactory effective amount of 4-hepten-2-yl salicylate, preferably (Z)-4-hepten-2-yl salicylate.
As used herein, "fragrance application" means any products, such as fine fragrances, e.g. eaux de perfume and eaux de toilette; household products, e.g. detergents for dishwasher, surface cleaner; laundry products, e.g. softener, bleach, detergent; body care products, e.g. shampoo, shower gel; and cosmetics, e.g. deodorants, vanishing cremes, comprising an odorant. This list of products is given by way of illustration and is not to be regarded as being in any way limiting.
The following list comprises examples of known odourant molecules and odourant natural extracts, which may be combined with 4-hepten-2-yl salicylate:
- essential oils and extracts, e.g. lavender oil, juniper oil, oak moss absolute, geranium
oil, jasmine absolute, patchouli oil, rose oil, sandalwood oil, lemon oil or ylang-ylang
- alkohols, e.g. citronellol, Ebanol®, eugenol, geraniol, Super Muguet, linalool,
phenylethyl alcohol, nerolidol, 3-hexenol, Sandalore®, terpineol or Timberol®.
- aldehydes and ketones, e.g. Azurone™, a-amylcinnamaldehyde, Georgywood,
hydroxycitronellal, Iso E Super, Isoraldeine, Hedione®, maltol, methyl cedryl ketone,
methylionone, beta-ionone, dihydrofarnesal or vanillin.
- ethers and acetals, e.g. Ambrox®, geranyl methyl ether, rose oxide or Spirambrene®.
- esters and lactones, e.g. benzyl acetate, cedryl acetate, y-decalactone, Helvetolide®,
y-undecalactone or vetivenyl acetate.
- macrocycles, e.g. ambrettolide, ethylene brassylate, Exaltolide®or Cosmone™.
- heterocycles, e.g. isobutylchinoline.
The compound of the present invention may be prepared by transesterification of 4-heptyn-2-ol with methyl salicylate to 4-heptyn-2-yl salicylate. Selective hydrogenation of 4-heptyn-2-yl salicylate results in (Z)-4-hepten-2-yl salicylate. The (E)-isomer is available in higher yields by hydrogenation of 4-heptyn-2-ol with lithium aluminium hydride in diethylenglycol dimethyl ether to the (E)-4-hepten-2-ol and subsequent transesterification with methyl salicylate. The starting compound 4-heptyn-2-ol may be prepared according to the procedure described by J.FIahaut et al., Helvetica Chimica Acta61, 2275(1978).
The invention is now further described with reference to the following non-limiting examples.
Example 1: 4-Hepten-2-yl salicylate
a) 4-Heptyn-2-yl salicylate
4-Heptyn-2-ol (22 g ; 0.2 mol) and methyl salicylate (30 g; 0.2 mol) are heated under stirring and nitrogen to 120°C. Titanium(IV)isopropoxide (0.5 g ;0.02 mol) is added via syringe in one portion and the reaction is heated under reduced vacuum (600 mbar) to 150°C meanwhile methanol is distilled off. After 24 h (75% conversion) the content of the flask is cooled to 25°C. High vacuum (0.1 Torr = 0.133 mbar) is applied and the
reaction mass short-path distilled, giving first 5 g of 4-heptyn-2-ol (23%) then at 118°C / 0.1 Torr (0.133 mbar) 35 g of 4-heptyn-2-yl salicylate (75%).
1H-NMR (400 MHz, CDCI3) : 5 1.10 (t, J=7.5 Hz, 3H), 1.46 (d, J=6.3 Hz, 3H), 2.14 (qt,
J=7.5, 2.5 Hz, 2H), 2.52 (ddt, J=16.4, 6.8, 2.5 Hz, 1H), 2.59 (ddt, J=16.4, 5.3, 2.5 Hz,
1H), 5.24 (dqd, J=6.8, 6.3, 5.3 Hz, 1H), 6.88 (ddd, J=8.2, 7.1, 1.0 Hz, 1H), 6.97 (dd,
J=8.3, 1.0 Hz, 1H), 7.45 (ddd, J=8.3, 7.1, 1.8 Hz, 1H), 7.86 (dd, J=8.2, 1.8 Hz, 1H),
IR: 1671, 1613, 1585, 1485, 1366, 1299, 1250, 1212, 1158,1138, 1088, 1050,
MS: 232(M*,9), 138(13), 121(100), 120(36), 94(23), 93(22), 79(37), 67(33), 65(28),
Odor description: white-floral scent reminiscent of certain lily species
b) (Z)-4-Hepten-2-yl salicylate
4-Heptyn-2-yl salicylate (24.6 g; 0.1 mol) dissolved in 30 ml abs. ethanol are stirred over palladium on bariumsulfate (0.4 g; 0.02 mol) and under hydrogen for 3 hours. Filtration over Celite and evaporation of the ethanol under reduced pressure gives 26.2 g crude product which is distilled over a Vigreux column giving 23.5 g (96%) of a slightly yellowish oil at 98°C / 0.1 Torr (0.133 mbar). Redistillation under the same conditions gives 21.6 g (88%) of colorless (Z)-4-hepten-2-yl salicylate.
1H-NMR (400 MHz, CDCI3) : 8 0.97 (t, J=7.5 Hz, 3H), 1.37 (d, J=6.3 Hz, 3H), 2.08 (qnd, J=7.5, 1.3 Hz, 2H), 2.40 (m, 1H), 2.51 (m, 1H), 5.20 (sx, J=6.3 Hz, 1H), 5.37 (dtt, J=10.9, 7.3, 1.5 Hz, 1H), 5.53 (dtt, J=10.9, 7.3, 1.5 Hz, 1H), 6.87 (ddd, J=8.1, 7.3, 1.3 Hz, 1H), 6.97 (dd, J=8.3, 1.3 Hz, 1H), 7.44 (ddd, J=8.3, 7.3, 1.8 Hz, 1H), 7.83 (dd, J=8.1, 1.8 Hz, 1H), 10.9 (s, 1H) ppm.
IR: 1669, 1613, 1586, 1485, 1366, 1299, 1249, 1212, 1157, 1089, 1047, 755, 700cm'1. MS: 234(M+,3), 138(17), 121(52), 120(28), 97(22), 96(44), 81(39), 65(23), 55(100), 41(22).
Odor description: crisp floral and green note reminiscent of aspects of certain lit; species and frangipani.
Example 2: (Z)-2-Methyl-3-hexen-1-yl salicylate
(Z)-2-Methyl-3-hexen-1-yl salicylate was prepared from (Z)-2-methyl-3-hexen-1-ol, the synthesis of which has been described elsewhere (Russian Journal of Organic Chemistry, 1992, 28, 220-225) and methyl salicylate as described in Example 1a) above. From (Z)-2-methyl-3-hexen-1-ol (5.9 g, 0.05 mol) and methyl salicylate (7.6 g, 0.05 mol) were thus obtained after distillation at 108-112 °C/0.3 mbar 7.5 g (Z)-2-methyl-3-hexen-1-yl salicylate (64%).
1H-NMR (400 MHz, CDCI3) : 5 0.97 (t, J=7.6 Hz, 3H), 1.08 (d, J=6.8 Hz, 3H), 2.07-2.12 (m, 2H), 2.99 (qtd, J=6.8, 6.8, 0.8 Hz, 1H), 4.11-4.21 (m, 2H), 5.18 (dd, J=10.8, 1.2 Hz, 1H), 5.47 (dd, J=10.8, 0.8 Hz, 1H), 6.86 (ddd, J=8.0, 7.2, 1.2 Hz, 1H), 6.97 (dd, J=8.8, 1.2 Hz, 1H), 7.44 (ddd, J=8.8, 7.2, 2.0 Hz, 1H), 7.83 (dd, J=8.0, 2.0 Hz, 1H), 10.78 (s, 1H) ppm.
IR: 2964, 1671, 1614, 1485, 1465, 1298, 1258, 1210, 1156, 1087, 963, 754, 699cm-1. MS: 234(M+,2), 138(16), 121(52), 9(37), 81(31), 65(21), 55(100), 39(16).
Odor description: floral, green, watery
Example 3: (Z)-3-Hexen-1-yl 2-hydroxy-3-methylbenzoate
(Z)-3-Hexen-1-yl 2-hydroxy-3-methylbenzoate was prepared from commercially available (Z)-hex-3-en-1-ol and methyl o-cresotinate as described in Example 1a) above. From (Z)-hex-3-en-1-ol (20.0 g, 0.2 mol) and methyl o-cresotinate (33.2 g, 0.2 mol) were thus obtained after distillation at 118 °C/0.2 mbar 37.2 g (Z)-3-hexen-1-yl 2-hydroxy-3-methylbenzoate (79%).
1H-NMR (400 MHz, CDCI3) : 5 0.98 (t, J=7.2 Hz, 3H), 2.09 (qi, J=7.2 Hz, 2H), 2.26 (s, 3H), 2.52 (q, J=6.8 Hz, 2H), 4.32 (t, J=6.8, 2H), 5.36-5.39 (m, 1H), 5.52-5.60 (m, 1H),
6.76 (t, J=7.6 Hz, 1H), 7.29 (d, J=7.6 Hz, 1H), 7.68 (d, J=7.6 Hz, 1H), 11.04 (s, 1H)
IR: 2963, 1667, 1614, 1390, 1327, 1288, 1246, 1170, 1150, 1083, 1010, 753, 728cm-1.
MS: 234(M+,9), 216(1), 152(38), 134(100), 106(31), 82(20), 77(27), 67(21), 55(59),
Odor description: floral, balsamic, slightly green and watery
Example 4: Determination of the GC-odor threshold values According to standard procedures known to the person skilled in the art, threshold values for volatile perfumery compounds are determined on a gas chromatograph equipped with a sniff port by a panel of trained evaluators. The lowest concentration smelled by each panelist is recorded as the individual threshold value expressed in ng (absolute amount of compound delivered at the sniff port).
By way of comparison, there were also tested (Z)-2-methyl-3-hexen-1-yl salicylate and (Z)-3-hexen-1-yl 2-hydroxy-3-methylbenzoate. The objective was to show the considerable effect exerted by the position of a substituent. Under identical conditions the odor threshold value for the individual compounds was measured. The results are given below.
odor threshold value [ng]
Compound geometric mean
(Z)-4-Hepten-2-yl salicylate 0.77
(Z)-3-Hexen-1-yl salicylate (comparative ex.) 0.92
(Z)-2-Methyl-3-hexen-1-yl salicylate (comparative ex.) 10
(Z)-3-Hexen-1-yl 2-hydroxy-3-methylbenzoate (comparative ex.) 201
As can bee seen from the results above although the compounds are structurally closely related to each other, the odor threshold values are quite different. Accordingly, it was not predictable that the compound of the present invention be similar to (Z)-3-hexen-1-yl salicylate.
Example 5: Fragrance composition of refreshing white-floral character
Parts by weight 1/1000
Ocimene (3,7-Dimethyl-1,2,6-octatriene) 4
Lemon oil Italy 8
cis-3-Hexenyl acetate 10% DPG 5
cis-3-Hexenol 10% DPG 5
cis-3-Hexenyl butyrate 10% DPG 4
Linalol synt. (3,7-Dimethyl-1,6-octadien-3-ol) 100
Farnesene (3,7,11-Trimethyl-1,3,6,10-dodecatetraene) 15
Methyl salicylate 3
Benzyl alcohol 30
Jasmone (3-Methyl-2-(2-pentenyl)-2-cyclopenten-1-one) 3
Phenylethyl 2-methylbutyrate 5
Nerolidol (3,7,11-Trimethyl-1,6,10-dodecatrienol-3) 35
cis-3-Hexenyl benzoate 40
Benzyl benzoate 150
Benzyl salicylate 300
Methyl anthranilate 1
cis-3-Hexenyl cis-3-hexenoate 10% DPG 10
Hedione (Methyl dihydrojasmonate) 30
Anapear (Methyl (E)-4,7-octadienoate) 10% DPG 5
Damascenone 1% DPG 1
Myraldyl acetate 50
Dipropylene glycol (DPG) 115
Addition of 100 parts of (Z)-4-hepten-2-yl salicylate makes the above composition much more sparkling and lush and a desired note of frangipani and lily species becomes much more developed.
Example 6: Fragrance composition of spicy white-floral character
Parts per weight 1/1000
cis-3-Hexenyl acetate 1
Linalyl acetate synt. 5
Bornyl acetate laevo 5
Methyl salicylate 2
Rhodinol pur 5
Benzyl alcohol 20
Phenylethyl alcohol 70
Amyl salicylate 10
Cinnamic alcohol 35
cis-3-Hexenyl benzoate 5
Benzyl berate 100
Phenylethyl benzoate 80
Benzyl salicylate 200
cis-3-Hexenyl cis-3-hexenoate 10% DPG 3
Methyl benzoate 3
cis-3-Hexenyl benzoate 35
Dipropylene qlvcol (DPG) 216
Addition of 100 parts of (Z)-4-hepten-2-yl salicylate makes above composition much more sparkling, lighter and fresher. Furthermore, it helps to develop a very attractive note of wild carnation and supports in general very much the desired spicy white-floral note.
Example 7: Fragrance composition with violet and freesia character
Parts by weight 1/1000
Myraldyl acetate 150
Rhodinol pur 30
trans-2-Dodecenal 10% DPG 3
cis-3-Hexenyl acetate 10% DPG 4
Dodecanal 10% DPG 3
Dipropylene glvcol (DPG) 197
Addition of 60 parts of (Z)-4-hepten-2-yl salicylate to the above fragrance accord makes the composition lush, sparkling and refreshing floral with a delicate green-fruity shade.
1. A compound selected from (Z)-4-hepten-2-yl salicylate.
2. A fragrance composition comprising (Z)-4-hepten-2-yl-salicylate .
3. A method of manufacturing a fragrance application comprising the incorporating an effective amount of (Z)-4-hepten-2-yl salicylate, wherein the fragrance application is selected from a group consisting of perfumes, household products, laundry products, body care products and cosmetics.
|Indian Patent Application Number||7468/DELNP/2006|
|PG Journal Number||40/2013|
|Date of Filing||11-Dec-2006|
|Name of Patentee||GIVAUDAN SA|
|Applicant Address||CHEMIN DE LA PARFUMERIE 5, CH-1214 VERNIER, SWITZERLAND|
|PCT International Classification Number||C08G69/08|
|PCT International Application Number||PCT/CH2005/000435|
|PCT International Filing date||2005-07-22|