METHOD FOR PURIFYING AMINOACETYLPYRROLIDINECARBONITRILE DERIVATIVE AND SALT THEREOF
申请人:Shiga Futoshi
公开号:US20110172444A1
公开(公告)日:2011-07-14
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).