Copper‐Catalyzed Addition of Grignard Reagents to in situ Generated Indole‐Derived Vinylogous Imines
作者:Luo Ge、Mercedes Zurro、Syuzanna R. Harutyunyan
DOI:10.1002/chem.202004232
日期:2020.12.9
Herein, the first protocol for catalytic asymmetric conjugateaddition of Grignard reagents to various sulfonyl indoles, offering a straightforward approach for the synthesis of chiral 3‐sec‐alkyl‐substituted indoles in high yields and enantiomeric ratios is presented. This methodology makes use of a chiral catalyst based on copper phosphoramidite complexes and in situ formation of vinylogous imine
Reaction of sulfonylindoles with protected β-nitro ketones affords the corresponding 3-(2-nitroalkyl)indoles that, under acidic conditions, undergo a sequence of cascade processes finally leading to unsymmetrical1,4-disubstitutedcarbazoles.