(1S,3aS,4R,4aS,5R,8aS)-4-(3,4-Dimethoxy-phenyl)-5-hydroxy-1,3a-dimethyl-octahydro-cyclopenta[1,4]cyclobuta[1,2]benzen-8-one                                                                                                                                                              在
                                                                                                                                                                                 
对甲苯磺酸                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以77%的产率得到(3aS,5aS,8S,8aS)-5-(3,4-Dimethoxy-phenyl)-5a,8-dimethyl-3,3a,5a,6,7,8-hexahydro-2H-cyclopenta[c]pentalen-1-one