Lewis Acid Catalyzed Direct Cyanation of Indoles and Pyrroles with <i>N</i>-Cyano-<i>N</i>-phenyl-<i>p</i>-toluenesulfonamide (NCTS)
作者:Yang Yang、Yan Zhang、Jianbo Wang
DOI:10.1021/ol202335p
日期:2011.10.21
BF3·OEt2-catalyzed direct cyanation of indoles and pyrroles using a less toxic, bench-stable, and easily handled electrophilic cyanating agent N-cyano-N-phenyl-para-toluenesulfonamide (NCTS) affords 3-cyanoindoles and 2-cyanopyrroles in good yields with excellent regioselectivity. The substrate scope is broad with respect to indoles and pyrroles.
Synthesis of 3-Cyanoindole Derivatives Mediated by Copper(I) Iodide Using Benzyl Cyanide
作者:On Ying Yuen、Pui Ying Choy、Wing Kin Chow、Wing Tak Wong、Fuk Yee Kwong
DOI:10.1021/jo3028278
日期:2013.4.5
Copper-mediated direct and regioselective C3-cyanation of indoles using benzyl cyanide as the cyanide anion source is presented. A wide range of indoles undergo cyanation smoothly by employing a reaction system of copper(I) iodide under open-to-air vessels.
Synthesis of N-Substituted Indole Derivatives via PIFA-Mediated Intramolecular Cyclization
作者:Yunfei Du、Renhe Liu、Gregory Linn、Kang Zhao
DOI:10.1021/ol062288o
日期:2006.12.1
A variety of N- arylated and N- alkylated indole derivatives were synthesized by way of a phenyliodine bis( trifluoroacetate) ( PIFA)- mediated intramolecular cyclization. This novel method allows for the construction of an indole skeleton by joining the N- atom on the side chain to the benzene ring at the last synthetic step. Other novel pyrrole- fused aromatic compounds can also be achieved by this method.