methyl (E)-3-[(1R,4S,8S,8aS)-8-ethyl-1'-methyl-4-oxido-2'-oxospiro[2,3,5,6,7,8a-hexahydroindolizin-4-ium-1,3'-indole]-8-yl]prop-2-enoate                                                                                                                                                              在
                                                                                                                                                                                 potassium diazodicarboxylate   、                                                                                                  
溶剂黄146                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 10.0h,
                                                                                                                以38%的产率得到methyl 3-[(1R,4S,8S,8aS)-8-ethyl-1'-methyl-4-oxido-2'-oxospiro[2,3,5,6,7,8a-hexahydroindolizin-4-ium-1,3'-indole]-8-yl]propanoate