A General Synthesis of Indole-3-carboxylic Esters by Palladium-Catalyzed Direct Oxidative Carbonylation of 2-Alkynylaniline Derivatives
作者:Bartolo Gabriele、Lucia Veltri、Raffaella Mancuso、Giuseppe Salerno、Mirco Costa
DOI:10.1002/ejoc.201200120
日期:2012.5
A generalsynthesis of indole-3-carboxylicesters by direct Pd-catalyzed oxidativecarbonylation of readily available 2-alkynylanilinederivatives is reported. In particular, 2-alkynylanilines bearing an internal triple bond and a secondary amino group (1) were directly converted into indole-3-carboxylicesters 2 in fair to good yields (50–84 %) when let to react with CO, O2, and an alcohol in the
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