The present invention herein provides a simple, efficient and industrially useful method for purifying an aminoacetylpyrrolidinecarbonitrile derivative which is useful as a DPP-IV inhibitor. The method comprises the steps of acting an acid such as maleic acid on an aminoacetylpyrrolidinecarbonitrile derivative represented by the following Formula 1 to form a salt, isolating the salt and then regenerating the foregoing derivative from the salt:
(In the formula, A represents CH
2
, CHF or CF
2
; R represents a C
1
to C
6
alkyl group which may have a substitutent, a C
3
to C
8
cycloalkyl group which may have a substitutent, an arylmethyl group which may have a substitutent, an arylethyl group which may have a substitutent, an aromatic hydrocarbon ring which may have a substitutent, an aromatic hetero ring which may have a substitutent, or an aliphatic hetero ring which may have a substitutent; and n represents 1 or 2).
本发明提供了一种简单、高效且在工业上有用的方法,用于纯化作为
DPP-IV
抑制剂有用的
氨基乙酰
吡咯烷腈衍
生物。该方法包括以下步骤:将如下式1所示的
氨基乙酰
吡咯烷腈衍
生物与酸(例如
马来酸)反应形成盐,分离该盐,然后从该盐中再生上述衍
生物:(在该式中,A代表
CH2、CHF或
CF2;R代表C1到C6烷基,该烷基可能具有取代基,C3到C8
环烷基,该
环烷基可能具有取代基,
苯基
甲基,该
苯基
甲基可能具有取代基,
苯基乙基,该
苯基乙基可能具有取代基,芳香族
碳氢环,该芳香族
碳氢环可能具有取代基,芳香族杂环,该芳香族杂环可能具有取代基,或
脂肪族杂环,该
脂肪族杂环可能具有取代基;n代表1或2)。