4,4-Dimethyl-5-[3-(4-methyl-2,6,7-trioxa-bicyclo[2.2.2]oct-1-yl)-propyl]-2-trifluoromethanesulfonyloxy-cyclopent-1-enecarboxylic acid methyl ester   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                                                              以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以96%的产率得到4,4-Dimethyl-2-(2-methyl-allyl)-5-[3-(4-methyl-2,6,7-trioxa-bicyclo[2.2.2]oct-1-yl)-propyl]-cyclopent-1-enecarboxylic acid methyl ester