The present invention relates to a process for the preparation of a N-(N'-substituted glycyl)-2-cyanopyrrolidine comprising at least (a) reacting, in the presence of dimethylformamide, a compound of formula (V) wherein, independently of each other, X1 and X3 are halogen; X2 is halogen, OH, O-C(=O)-CH2X3, -O-SO2-(C1-8)alkyl or -O-SO2-(aryl), with L-prolinamide, followed by (b) reacting the resultant compound without isolation with a dehydration agent, optionally followed by (c) reacting, in the presence of a base, the resultant compound without isolation with an appropriate amine and (d) recovering the resultant cornpound in free form or in acid addition salt form.
本发明涉及一种制备N-(N'-取代甘
氨基)-
2-氰基吡咯烷的方法,包括至少以下步骤:(a) 在二甲基甲酰胺存在下,将具有式(V)的化合物与L-脯
氨酰胺反应,其中X1和X3分别为卤素;X2为卤素、羟基、O-C(=O)-CH2X3、-O-SO2-(C1-8)烷基或-O-SO2-(芳基);然后(b) 在不分离的情况下,将所得化合物与脱
水剂反应;随后可选择(c) 在碱存在下,将所得化合物在不分离的情况下与适当的胺反应;(d) 以自由形式或酸盐形式回收所得化合物。