3,4-dihydro-4-methoxycarbonyl-2-methyl-3-oxo2H-thieno[ 2,3-e] 1,2-thiazine 1,1-dioxide   、                                                                                      
2-氨基吡啶                                                                                                                                                              在
                                                                                                                                                                                 
溶剂黄146                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
邻二甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以3,4-Dihydro-2-methyl-3-oxo-4-(2-pyridyl-carbamoyl)-2H-thieno[2,3-e]1,2-thiazine 1,1-dioxide, melting point 255° C. to 256° C. (decomposition), is obtained的产率得到3,4-Dihydro-2-methyl-3-oxo-4-(pyridin-2-yl-carbamoyl)-2H-thieno[2,3-e]1,2-thiazin 1,1-dioxide