Enantioselective Addition Reaction of Azlactones with Styrene Derivatives Catalyzed by Strong Chiral Brønsted Acids
作者:Jun Kikuchi、Masahiro Terada
DOI:10.1002/anie.201903111
日期:2019.6.17
An enantioselective intermolecular addition reaction of azlactones, as carbon nucleophiles, with styrene derivatives, as simple olefins, was demonstrated using a newly developed chiral Brønsted acid catalyst, namely, F10BINOL‐derived N‐triflyl phosphoramide. Addition products having vicinal tetrasubstituted carbon centers, one of which is an all‐carbon quaternary stereogenic center, were formed in
使用新开发的手性布朗斯台德酸催化剂,即F 10 BINOL衍生的N-三氟乙磷酰胺,证明了作为碳亲核体的氮杂内酯与作为简单烯烃的苯乙烯衍生物的对映选择性分子间加成反应。形成具有临近四取代碳中心的加成产物,其中之一是全碳四元立体构象中心,形成的产率高,立体选择性中等至高。新的手性布朗斯台德酸具有极高的酸度,这是基于DFT研究计算出的p K a值所证实的,这不仅是实现高催化活性,而且是分子间加成中高效立体控制的关键。