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。