A series of chiral bifunctional N-heterocyclic carbene (NHC) precursors with a proximal hydroxy group were smoothly prepared from l-pyroglutamic acid. Promising enantiomeric excesses (up to 44% ee) were achieved for the bifunctional NHC-catalyzed enantioselective aza-Morita-Baylis-Hillman reaction of cyclopent-2-enone with N-tosylphenylmethanimine.
以 l-焦谷
氨酸为原料,顺利制备了一系列带有近端羟基的手性双功能 N-杂环碳烯(NHC)前体。在双功能 NHC 催化的环戊-2-烯酮与 N-对
甲苯磺酰基苯基甲
亚胺的对映体选择性杂-莫里塔-贝利斯-希尔曼反应中,实现了良好的对映体过量(高达 44% ee)。