4-dimethylaminophenylamine dihydrochloride 、
7-formyl-4-methyl-3-methylthio-2,2-dioxo-1-phenyl-1H-thieno<3,4-c><1,2>thiazine 在
氢氧化钾 作用下,
以
乙醇 为溶剂,
反应 4.0h,
以92%的产率得到4-methyl-3-methylthio-7-(4-N,N-dimethylaminoanilinomethylidene)-2,2-dioxo-1-phenyl-1H-thieno<3,4-c><1,2>thiazine