Selective Access to 3-Cyano-1<i>H</i>-indoles, 9<i>H</i>-Pyrimido[4,5-<i>b</i>]indoles, or 9<i>H</i>-Pyrido[2,3-<i>b</i>]indoles through Copper-Catalyzed One-Pot Multicomponent Cascade Reactions
作者:Bin Li、Shenghai Guo、Ju Zhang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.5b00239
日期:2015.6.5
Novel and selective synthetic approaches toward indole derivatives via copper-catalyzedone-pot multicomponent cascade reactions of 1-bromo-2-(2,2-dibromovinyl)benzenes with aldehydes and aqueous ammonia are presented. Intriguingly, the concentration of ammonia, the molar ratio of reagents, and the structural features of the aldehyde substrate serve as key factors in controlling the selective formation
Indoles undergo smooth cyanation with CuCN in the presence of 20 mol% Pd(OAc)(2) and 40 mol% CuBr2 in DMF to produce a wide range of the corresponding 3-cyanoindoles in good yields with high regioselectivity. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of Substituted 3-Cyano- and 3-(Arenesulfonyl)indoles from o-Nitrobenzyl Cyanides and Sulfones
作者:Krzysztof Wojciechowski、Zbigniew Wróbel
DOI:10.1055/s-0030-1289515
日期:2011.10
enamines, in the reaction of o-nitrophenylacetonitriles with Vilsmeier reagents, followed by reductive cyclization using Zn in acetic acid, leads to variously substituted 3-cyanoindoles, possessing aryl, alkyl, and aminoalkyl substituents at C-2. The method, when starting from the appropriate o-nitrobenzylsulfones, allows the synthesis of substituted 3-(arenesulfonyl)-indoles. indoles - amides - cyclization