Bifunctional Borane Catalysis of a Hydride Transfer/Enantioselective [2+2] Cycloaddition Cascade
作者:Ming Zhang、Xiao‐Chen Wang
DOI:10.1002/anie.202106168
日期:2021.7.26
Herein, we present a mild and efficient method for synthesizing enantioenriched tetrahydroquinoline-fused cyclobutenes through a cascade reaction between 1,2-dihydroquinolines and alkynones with catalysis by chiral spiro-bicyclic bisboranes. The bisboranes served two functions: first they catalyzed a hydride transfer to convert the 1,2-dihydroquinoline substrate to a 1,4-dihydroquinoline, and then
在此,我们提出了一种温和有效的方法,通过 1,2-二氢喹啉和炔酮之间的级联反应在手性螺双环双硼烷的催化下合成对映体富集的四氢喹啉稠合环丁烯。双硼烷有两个功能:首先它们催化氢化物转移将 1,2-二氢喹啉底物转化为 1,4-二氢喹啉,然后它们激活炔酮底物与 1 进行对映选择性 [2+2] 环加成反应, 4-二氢喹啉原位生成。