申请人:ZHEJIANG HUAHAI PHARMACEUTICAL CO., LTD.
公开号:US20170305822A1
公开(公告)日:2017-10-26
Disclosed is a method for synthesizing a sitagliptin intermediate, the method comprising: in the presence of hydrogen and a transition metal catalyst having a chiral phosphine ligand, subjecting a compound of formula II to an asymmetric reductive amination with ammonia or ammonium salt in a proper organic solvent under the condition of adding an acidic additive to produce a compound of formula I, wherein, an R- or S-configuration of a stereocenter is represented by *; the compound of formula I of R configuration can be used to prepare sitagliptin, and a reaction formula is as follows: R
1
and R
2
are each independently selected from hydrogen, C
1
-C
12
linear or branched alkyl, C
3
-C
12
cycloalkyl, C
2
-C
12
alkenyl, C
2
-C
12
alkynyl and C
7
-C
12
arylalkyl. The method has a high yield and a high ee % value, a mild reaction condition and a low production cost, and is simple to operate, convenient to purify, environmental friendly and suitable for industrial production.
本发明公开了一种合成西格列汀中间体的方法,该方法包括:在氢和具有手性膦配体的过渡金属催化剂的存在下,在适当的有机溶剂中加入酸性添加剂的条件下,将式II化合物经过不对称还原胺化反应与氨或铵盐反应,生成式I化合物,其中,立体中心的R-或S-构型由*表示;R构型的式I化合物可用于制备西格列汀,反应式如下:其中,R1和R2分别独立地选自氢、C1-C12线性或支链烷基、C3-C12环烷基、C2-C12烯基、C2-C12炔基和C7-C12芳基烷基。该方法具有高产率和高ee%值,反应条件温和,生产成本低,操作简单,易于纯化,环保友好,适用于工业生产。