甲醇 、
methyl (2E)-3-[(1R,2S,4R,7R)-3,3-dichloro-8,8-dimethyl-6-oxo-5-oxatricyclo[5.1.0.0(2,4)]oct-4-yl]prop-2-enoate 在
sodium methylate 作用下,
反应 2.0h,
以87%的产率得到methyl (1R,3R)-3-[(1Z)-2-chloro-5-methoxy-5-methoxycarbonyl-3-oxopent-1-en-1-yl]-2,2-dimethylcyclopropane-1-carboxylate