发明授权
US07030241B2 Mesylates of piperazine derivatives and process for their preparation 失效
哌嗪衍生物的甲磺酸酯及其制备方法

Mesylates of piperazine derivatives and process for their preparation
摘要:
The invention relates to the mesylates of a group of piperazine derivatives and to a process for the preparation of these mesylates in an economic way in the high yield and of high purity. According to the process of the invention the synthesis of the piperazine ring and the mesylate formation are combined in a single reaction step. The invention relates to the mesylate of compounds of the formula (I) wherein X is a bicyclic heterocyclic phenyl group and Y is methyl, ethyl (optionally substituted with fluorine), cycloalkyl (3–7C) methyl, benzyl or m-phenyl benzyl
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