The present invention relates to a process for the preparation of a compound of formula (I) or a pharmaceutically acceptable salt thereof:
wherein R represents one or more groups independently selected from fluorine, chlorine, bromine, and iodine,
said process comprising the cyclopropanation of a compound of formula (II) with ethylene carbonate or ethylene sulfate:
wherein X is chlorine, bromine, iodine or a triflate group (CF
3
SO
3
) or a group
wherein R is as defined above and G is —CN or —COOR
2
wherein R
2
is a C
1
-C
4
straight or branched alkyl chain.
本发明涉及一种制备式(I)化合物或其药学上可接受的盐的方法,其中R代表从
氟、
氯、
溴和
碘中独立选择的一个或多个基团,该方法包括将式(II)化合物与
碳酸乙烯酯或
硫酸乙烯酯进行
环丙烷化反应:其中X为
氯、
溴、
碘或三
氟甲磺酰基(CF3SO3)或一个基团,其中R如上所定义,G为—CN或—COOR2,其中R2为C1-C4直链或支链烷基链。