丁炔二酸二甲酯   、                                                                                      trans-4-tert-butylamino-6,7-bis(tert-butyldimethylsilyloxy)-2,3,6,7-tetrahydro-5-methoxy-1H-cyclobuta[1,2-e]indene                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以82%的产率得到dimethyl (4-tert-butylamino-6-tert-butyldimethylsilyloxy-2,3-dihydro-5-methoxy-1H-cyclopenta[a]naphthalene-7,8-dicarboxylate)