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
申请人:Kothari Himanshu Madhusudan
公开号:US20110213149A1
公开(公告)日:2011-09-01
The present invention relates to synthesis of β-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 β-amino acrylic acid or derivative there of, by using borane containing reducing agents at atmospheric pressure. The resulting racemic β-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).
本发明涉及通过一种新方法合成公式(I)的β-氨基酸衍生物及其公式(Ia)的盐。该方法包括使用含硼烷还原剂在大气压下还原受保护或未保护的β-氨基丙烯酸或其衍生物,生成外消旋β-氨基化合物,然后将其分离成公式(I)的纯立体异构体,具体为(2R)-4-氧代-4-[3-三氟甲基)-5,6-二氢-[1,2,4]三唑[4,3-a]吡嗪-7(8H)-基]-1-(2,4,4-三氟苯基)丁-2-胺。在一个实施例中,本发明揭示了公式(I)的多形式、公式(I)的磷酸盐以及公式(I)的苹果酸二苯甲酰盐。