Scandium(III)‐exchanged zeolite was used as heterogeneous ligand‐free catalysts for the [4+2]cyclocondensation of amines and aldehydes with alkenes through the in situ formation of imines. Such catalysts offered a versatile, efficient, and highly regio‐ and stereoselective synthesis of tetrahydroquinoline derivatives. These catalysts exhibited a wide scope and compatibility with functional groups.
通过原位形成
亚胺,(III)交换的
沸石用作胺和醛与烯烃的[4 + 2]环缩合反应的无均相无
配体催化剂。此类催化剂提供了
四氢喹啉衍
生物的通用,高效和高度区域选择性和立体选择性的合成方法。这些催化剂表现出宽范围和与官能团的相容性。它们非常易于使用,易于移除(通过简单过滤),并且可回收(最多可重复使用三遍,而不会损失活性)。