The present invention describes a process for the preparation of sitagliptin or its pharmaceutically acceptable salts of formula (1) comprising the steps of a) condensation of compound of formula (2), wherein R is amino protecting group with compound of formula (3), which may be used in its free base form or in a form of a salt in the presence of a coupling agent and a basic solvent that is N-methylimidazole to obtain the compound of formula (4), and b) deprotection of compound of formula (4) to obtain sitagliptin base that can be further transformed into its pharmaceutically acceptable salt. The process is cost effective, environmentally friendly, inexpensive and easily scaled up to commercial level.
本发明描述了一种制备
盐酸西格列汀或其药学上可接受的盐的方法,其
化学式为(1),包括以下步骤:a)在
偶联剂和碱性溶剂
N-甲基咪唑的存在下,将化合物式为(2)的
氨基保护基与化合物式为(3)的化合物缩合,所述化合物可以以其自由碱基形式或盐的形式使用,以获得化合物式为(4)的化合物;b)去保护化合物式为(4),以获得
西格列汀碱,进而转化为其药学上可接受的盐。该方法具有成本效益、环保、低廉和易于扩大规模到商业
水平的优点。