(tert-butoxycarbonyl)((1-methyl-1H-imidazol-3-ium-3-yl)sulfonyl)amide   、                                                                                      
2,5-Bis(2,3-dihydroindol-1-ylmethylidene)cyclopentan-1-one                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 2.5h,
                                                                                                                以83%的产率得到N-[(5E)-2-(2,3-dihydroindol-1-ium-1-ylidenemethyl)-5-(2,3-dihydroindol-1-ylmethylidene)cyclopenten-1-yl]-N-[(2-methylpropan-2-yl)oxycarbonyl]sulfamate