2-氨基吡啶   、                                                                                      
methyl 1,5-dihydro-7-hydroxy-5-methyl-1,3-diphenylpyrazolo<3,4-e><1,2>thiazine-6-carboxylate 4,4-dioxide                                                                                                                                                                                              以
                                                                                         
邻二甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 6.0h,
                                                                                                                以83%的产率得到2,5-dihydro-4-hydroxy-2-methyl-5,7-diphenyl-N-(pyrid-2-yl)pyrazolo<3,4-e><1,2>thiazine-3-carboxamide 1,1-dioxide