1-<(4-Methoxyphenyl)methylthio>-2,5-pyrrolidindion 、
diethyl 1,4-dimethyl-3,6-dioxopiperazine-2,5-dicarboxylate 在
hydroquinindine-2,5-diphenyl-4,6-pyrimidinediyl diether 作用下,
以
甲苯 为溶剂,
以80%的产率得到Diethyl trans-2,5-bis(4-methoxybenzylsulfanyl)-1,4-dimethyl-3,6-dioxopiperazine-2,5-carboxylate