Title of Invention | IMPROVED PROCESS FOR ZOPICLONE SYNTHESIS |
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Abstract | An improved process for Zopiclone comprises three steps : one pot synthesis of 6-(5-chloropyrid-2-yl)-5,7-dioxo-5, 6-dihydropyrrolo [3,4-b]pyrazine (IV) from pyrazine-2, 3-dicarboxylic acid (II) and 2-amino-5-chloropyridine (III) without using any hazardous solvent or reagent; selective reduction of the 6-(5-chloropyrid-2-yl)-5,7-dioxo-5, 6-dihydropyrrolo [3,4-b]pyrazine (IV) with sodium borohydride in biphasic system to obtain 6-(5-chloropyrid-2-yl)-5-hydroxy-7-oxo-5,6-dihydropyrrolo-[3,4-b]pyrazine (V) and further converted compound (V) to Zopiclone (I). |
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645-mum-2004-abstract(16-12-2004).pdf
645-MUM-2004-ABSTRACT(3-12-2008).pdf
645-MUM-2004-ABSTRACT(7-5-2009).pdf
645-mum-2004-abstract(granted)-(25-3-2011).pdf
645-mum-2004-cancelled pages(4-3-2011).pdf
645-mum-2004-claims(16-12-2004).pdf
645-MUM-2004-CLAIMS(3-12-2008).pdf
645-MUM-2004-CLAIMS(7-5-2009).pdf
645-MUM-2004-CLAIMS(AMENDED)-(4-3-2011).pdf
645-mum-2004-claims(granted)-(25-3-2011).pdf
645-MUM-2004-CLAIMS(MARKED COPY)-(4-3-2011).pdf
645-MUM-2004-CORRESPONDENCE(21-2-2011).pdf
645-MUM-2004-CORRESPONDENCE(3-12-2008).pdf
645-MUM-2004-CORRESPONDENCE(7-5-2009).pdf
645-mum-2004-correspondence(ipo)-(28-3-2011)).pdf
645-mum-2004-description(complete)-(16-12-2004).pdf
645-MUM-2004-DESCRIPTION(COMPLETE)-(3-12-2008).pdf
645-MUM-2004-DESCRIPTION(COMPLETE)-(7-5-2009).pdf
645-mum-2004-description(granted)-(25-3-2011).pdf
645-mum-2004-description(provisional)-(14-6-2004).pdf
645-MUM-2004-EXAMINATION REPORT(3-12-2008).pdf
645-MUM-2004-FORM 1(14-6-2004).pdf
645-mum-2004-form 1(23-6-2004).pdf
645-mum-2004-form 18(22-6-2006).pdf
645-mum-2004-form 2(3-12-2008).pdf
645-mum-2004-form 2(7-5-2009).pdf
645-mum-2004-form 2(complete)-(16-12-2004).pdf
645-mum-2004-form 2(granted)-(25-3-2011).pdf
645-mum-2004-form 2(provisional)-(14-6-2004).pdf
645-MUM-2004-FORM 2(TITLE PAGE)-(3-12-2008).pdf
645-MUM-2004-FORM 2(TITLE PAGE)-(7-5-2009).pdf
645-mum-2004-form 2(title page)-(complete)-(16-12-2004).pdf
645-mum-2004-form 2(title page)-(granted)-(25-3-2011).pdf
645-mum-2004-form 2(title page)-(provisional)-(14-6-2004).pdf
645-mum-2004-form 26(5-7-2004).pdf
645-MUM-2004-FORM 3(14-6-2004).pdf
645-MUM-2004-FORM 3(3-12-2008).pdf
645-MUM-2004-FORM 5(16-12-2004).pdf
645-MUM-2004-REPLY TO HEARING(4-3-2011).pdf
645-MUM-2004-SPECIFICATION(AMENDED)-(7-5-2009).pdf
654-mum-2004-form 13(16-11-2006).pdf
Patent Number | 247051 | ||||||||
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Indian Patent Application Number | 645/MUM/2004 | ||||||||
PG Journal Number | 13/2011 | ||||||||
Publication Date | 01-Apr-2011 | ||||||||
Grant Date | 25-Mar-2011 | ||||||||
Date of Filing | 14-Jun-2004 | ||||||||
Name of Patentee | CALYX CHEMICALS & PHARMACEUTICALS LIMITED | ||||||||
Applicant Address | 5,MARWAH S COMPLEX, SAKIVIHAR ROAD, SAKINAKA, ANDHERI (E), MUMBAI-400072. | ||||||||
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PCT International Classification Number | C07544/238 | ||||||||
PCT International Application Number | N/A | ||||||||
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