Catalytic Asymmetric Dearomatization of 2,3-Disubstituted Indoles by a [4 + 2] Cycloaddition Reaction with In Situ Generated Vinylidene <i>ortho</i>-Quinone Methides: Access to Polycyclic Fused Indolines
作者:Amit Shikari、Chandrakanta Parida、Subhas Chandra Pan
DOI:10.1021/acs.orglett.4c00557
日期:——
A protocol of enantioselective dearomatization of 2,3-disubstituted indoles by an organocatalytic intermolecular (4 + 2) cycloaddition reaction with in situ generated vinylidene ortho-quinone methide has been documented. A wide range of polycyclic 2,3-fused indolines containing vicinal quaternary carbon stereocenters was readily prepared in high yields and with excellent diastereo- and enantioselectivities
已记录了通过有机催化分子间 (4 + 2) 环加成反应与原位生成的亚乙烯基邻醌甲基化物对 2,3-二取代吲哚进行对映选择性脱芳构化的方案。多种含有邻位季碳立构中心的多环2,3-稠合二氢吲哚很容易以高产率制备,并具有优异的非对映选择性和对映选择性。