Tetrabutylammonium fluoride catalytically induced a regioselective 1,3-cycloaddition of the carbanions leading to 2,2,4-substituted pyrrolidines. And in the presence of trifluoroacetic acid, the corresponding 2,2,3-substituted products were regioselectively obtained via the intermediary azomethine ylide.
四丁基氟化铵催化诱导碳负离子的区域选择性 1,3-环加成,生成 2,2,4-取代的
吡咯烷。并在
三氟乙酸存在下,通过中间偶氮甲碱叶立德区域选择性地得到相应的2,2,3-取代产物。