Phenyl α-bromovinyl sulfone reacts with glycine ester Schiff bases regioselectively in the presence of catalytic amounts of AgOAc and DBU yielding polysubstituted pyrrolidine cycloadducts. Utilization of excess DBU induces subsequent facile aromatization of the cycloadducts and affords 5-arylpyrrole-2-carboxylic acid esters in 39–85% yields in a single step.
在催化量的AgOAc和
DBU存在下,苯基α-
溴乙烯基砜与甘
氨酸酯Schiff碱发生区域选择性反应,生成多取代的
吡咯烷环加合物。利用过量的
DBU可以使环加合物随后轻松地进行芳构化,并一步获得3-芳基
吡咯-2-羧酸酯,产率为39-85%。