A simple change of ligand and solvent allows controlled, effective switching between cyclization–carbonylation and cyclization–carbonylation–cyclization-coupling (CCC-coupling) reactions.
Ag(I)-Catalyzed Indolization/C3-Functionalization Cascade of 2-Ethynylanilines via Ring Opening of Donor–Acceptor Cyclopropanes
作者:Raju Karmakar、Arun Suneja、Vinod K. Singh
DOI:10.1021/acs.orglett.6b01057
日期:2016.6.3
A AgSbF6-catalyzed cascade involving the ringopening of donor–acceptorcyclopropanes (DACs) preceded by the cyclization of N-protected 2-ethynylaniline is described. The method discloses a step-economy route to 2,3-disubstituted indole, where a Ag catalyst is found to trigger the cascade by activating both alkyne and DACs. Various functionalities at different ends of both substrates offer rapid access