An enantioselective cascade aerobic oxidation and semipinacol rearrangement reaction of 2‐aryl‐3‐alkyl‐substituted indoles via visible‐light‐driven cooperative organophotoredox and H‐bonding catalysis is reported. The current method provides an expedient and sustainable approach to furnish a variety of valuable chiral 2‐aryl‐2‐alkyl‐substituted indolin‐3‐ones in 64–90 % yield with 58–94 % ee. Preliminary
Enantioselective Oxidative Cross-Coupling Reaction of 3-Indolylmethyl CH Bonds with 1,3-Dicarbonyls Using a Chiral Lewis Acid-Bonded Nucleophile to Control Stereochemistry
作者:Chang Guo、Jin Song、Shi-Wei Luo、Liu-Zhu Gong
DOI:10.1002/anie.201002108
日期:——
A highly enantioselective CH‐activation‐based oxidativecouplingreaction of 3‐arylmethylindole derivatives with dibenzyl malonate by using chiral Lewis acid bonded nucleophiles provided an approach to indole derivatives (see scheme; DDQ=2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone, OTf=trifluoromethanesulfonate).
l rearrangement has been successfully developed. This methodology allows for efficient conversion of a wide range of indoles into the synthetically significant 2,2-disubstituted indolin-3-ones, the core structure of pseudoindoxyl alkaloids, under mild reaction conditions.