(Z)-3-[(ethoxycarbonylmethylthio)mercaptomethylene]-1-methyl-2(3H)-indolizinone 、
溴乙酸乙酯 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
氯仿 为溶剂,
反应 0.17h,
生成 ethyl 3-ethoxycarbonylmethylthio-5-methyl-4-oxo-1H-8,8a-dihydro-1,4-thiazino[3,4,5-cd]indolizine-1-carboxylate 、 ethyl 3-ethoxycarbonylmethylthio-5-methyl-4-oxo-1H-8,8a-dihydro-1,4-thiazino[3,4,5-cd]indolizine-1-carboxylate