申请人:Pu Yu-Ming
公开号:US08816086B2
公开(公告)日:2014-08-26
A process for the preparation of compounds of formula (I) or a salt thereof
wherein X1, X2, X3, X4, Rx, u, R2, R1g, z, and A1 are as defined in the specification is disclosed.
本发明揭示了一种用于制备式(I)化合物或其盐的方法,其中X1、X2、X3、X4、Rx、u、R2、R1g、z和A1的定义在说明书中。