异丁烯基三甲基硅烷   、                                                                                      
ethyl (1R,3S,3aR,7R,7aR)-7-isopropyl-4-methylene-3-((4-nitrobenzyl)oxy)octahydroisobenzofuran-1-carboxylate   、                                                                                      
ethyl (1R,3R,3aR,7R,7aR)-7-isopropyl-4-methylene-3-((4-nitrobenzyl)oxy)octahydroisobenzofuran-1-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
三氟甲磺酸三甲基硅酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        以60%的产率得到ethyl (1R,3R,3aR,7R,7aR)-4-methylidene-3-(2-methylprop-2-enyl)-7-propan-2-yl-3,3a,5,6,7,7a-hexahydro-1H-2-benzofuran-1-carboxylate