[EN] SALTS OF 6-(5-CHLORO-2-PYRIDYL)-5-[(4-METHYL-1-PIPERAZINYL)CARBONYLOXY]-7-OXO-6,7- DIHYDRO-5H-PYRROLO[3,4-B]PYRAZINE [FR] SELS DE 6-(5-CHLORO-2-PYRIDYL)-5-[(4-MÉTHYL-1-PIPÉRAZINYL)CARBONYLOXY]-7-OXO-6,7-DIHYDRO-5H-PYRROLO[3,4-B] PYRAZINE
A process for racemisation of 6-(5-chloropyridin-2-yl)-7-(4-methyl-1-piperazinyl)carbonyloxy-7-oxo-6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine
申请人:LEK Pharmaceuticals d.d.
公开号:EP2345655A1
公开(公告)日:2011-07-20
The present invention provides a new process of recovering zopiclone from unwanted enantiomer by racemisation using aliphatic amines in amide solvents. The process of the present invention can give product in high yield with low amount of impurities and can be carried out on an industrial scale. The present invention provides also a method for resolving the enantiomers of zopiclone by means of chiral chromatography using stationary phase which comprises amylose tris (3,5-dimethylphenylcarbamate) immobilised on silica gel.
METHODS FOR PREPARING ESZOPICLONE CRYSTALLINE FORM A, SUBSTANTIALLY PURE ESZOPICLONE AND OPTICALLY ENRICHED ESZOPICLONE
申请人:MENDELOVICI Marioara
公开号:US20070270590A1
公开(公告)日:2007-11-22
The present invention provides methods for preparing eszopiclone Form A, substantially chemically pure eszopiclone, or eszopiclone with low level(s) of residual solvent(s). The present invention also provides eszopiclone with low level(s) of residual solvent(s). The present invention also provides a process for optical enrichment of eszopiclone free base. For instance, one of the embodiments of the invention is directed to a method of preparing eszopiclone Form A, wherein the method comprises crystallizing eszopiclone free base from a solvent selected from the group consisting of isopropanol (IPA), methyl isobutyl ketone (MIBK), acetone, n-butanol, i-butanolisobutanol, 2-butanol, tetrahydrofuran (THF), dimethyl carbonate, methanol, ethanol, ethyl lactate, dimethylformamide (DMF), carbon tetrachloride, toluene, iso-butyl acetate and mixtures thereof.
本发明提供了制备eszopiclone Form A,基本上是化学纯的eszopiclone,或低水平残留溶剂的eszopiclone的方法。本发明还提供了低水平残留溶剂的eszopiclone。本发明还提供了eszopiclone自由碱的光学富集过程。例如,本发明的一种实施例涉及一种制备eszopiclone Form A的方法,其中该方法包括从以下溶剂中结晶eszopiclone自由碱,所述溶剂由以下组成:异丙醇(IPA),甲基异丁基酮(MIBK),丙酮,正丁醇,异丁醇,2-丁醇,四氢呋喃(THF),碳酸二甲酯,甲醇,乙醇,乙酸乙酯,二甲基甲酰胺(DMF),四氯化碳,甲苯,异丁醋酸酯和其混合物。
WO2008/2629
申请人:——
公开号:——
公开(公告)日:——
[EN] MELATONIN COMBINATION THERAPY FOR IMPROVING SLEEP QUALITY<br/>[FR] POLYTHERAPIE A BASE DE MELATONINE DESTINEE A AMELIORER LA QUALITE DU SOMMEIL