methyl(1RS,3RS,7SR)-8,8-dibromobicyclo<5.1.0>octane-4-spiro-2'-(1,3-dioxolane)-3-carboxylate   、                                                                                      
碘甲烷   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                                                                                                                                                                          以62%的产率得到methyl(1RS,3RS,7SR)-8,8-dimethylbicyclo<5.1.0>octane-4-spiro-2'-(1,3-dioxolane)-3-carboxylate