IMPROVED PROCESS FOR PREPARATION OF (2R)-4-OXO-4-[3- (TRIFLUOROMETHYL)-5,6-DIHYDRO [1,2,4]-TRIAZOLO[4,3-A]PYRAZIN- 7(8H)-YL]-L-(2,4,5-TRIFLUOROPHENYL)BUTAN-2-AMINE & NEW IMPURITIES IN PREPARATION THEREOF

The present invention relates to synthesis of ß-amino acid derivatives of formula (I) and its salts of formula (Ia) by a novel process. The process comprises the reduction of a protected or unprotected prochiral ß-amino acrylic acid or derivative there of, by using borane containing reducing agents...

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Main Authors PANDEY, BIPIN, KOTHARI, HIMANSHU, MADHUSUDAN, DAVE, MAYANK, GHANSHYAMBHAI, SHUKLA, BHAVIN, SHRIPRASAD
Format Patent
LanguageEnglish
French
Published 19.08.2010
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Summary:The present invention relates to synthesis of ß-amino acid derivatives of formula (I) and its salts of formula (Ia) by a novel process. The process comprises the reduction of a protected or unprotected prochiral ß-amino acrylic acid or derivative there of, by using borane containing reducing agents at atmospheric pressure. The resulting racemic ß-amino compound is resolved to a pure stereoisomer of formula (I), specifically to (2R)-4-oxo-4- [3-Ctrifluoromethyl)-5, 6-dihydrol [1,2,4]triazolo [4,3-alpyrazin-7(8H)-yl]-1-(2,4,4-trifluorophenyl)butan-2-amine. In an embodiment the invention disclosed polymorphic forms of formula (I), phosphate salt of formula (I) and also a Dibenzoyl-L-tartaric acid salt of formula (I). La présente invention concerne la synthèse de dérivés d'acides aminés ß de formule (I) et de leurs sels de formule (Ia) par un nouveau procédé. Le procédé comprend la réduction d'un acide ß-aminoacrylique prochiral protégé ou non protégé ou d'un de ses dérivés en utilisant des agents réducteurs contenant du borane à pression atmosphérique. Le composé ß-amino racémique obtenu est séparé en un stéréo-isomère pur de formule (I), spécifiquement la (2R)-4-oxo-4-[3-(trifluorométhyl)-5,6-dihydro[1,2,4]-triazolo [4,3-a]pyrazin-7(8H)-yl]-1-(2,4,4-trifluorophényl)butan-2-amine. Dans un mode de réalisation, l'invention concerne des formes polymorphes de formule (I), un sel de phosphate de formule (I) et également un sel d'acide dibenzoyl-L-tartrique de formule (I).
Bibliography:Application Number: WO2009IN00470