Amine Directed Pd(II)-Catalyzed C–H Activation-Intramolecular Amination of <i>N</i>-Het(aryl)/Acyl Enaminonitriles and Enaminones: An Approach towards Multisubstituted Indoles and Heterofused Pyrroles
作者:Somaraju Yugandar、Saidulu Konda、Hiriyakkanavar Ila
DOI:10.1021/acs.joc.5b02902
日期:2016.3.4
of either palladium acetate/cupric acetate catalytic system under oxygen atmosphere or palladium acetate/silver carbonate in the presence of pivalic acid as additive. The method is compatible with a diverse range of substituents on the aryl ring as well as at the 2- and 3-positions of the indole ring. The versatility of this method was further demonstrated by elaborating it for the synthesis of heterofused
通过分子内氧化C–H活化胺化现有的2-(杂)芳基-3-(杂)芳基/烷基-3-(杂)芳基/酰基氨基丙烯腈/烯胺酮前体,开发了一种多取代吲哚的有效途径。在氧气气氛下存在乙酸钯/乙酸铜催化体系,或在新戊酸作为添加剂的情况下存在乙酸钯/碳酸银。该方法与芳基环以及吲哚环的2-和3-位上的各种取代基兼容。详细说明了该方法的多功能性,可用于合成杂稠稠合的吡咯,如噻吩并[2,3- b ]吡咯,噻吩并[3,2- b ]吡咯,吡咯并[2,3- b ]吲哚和pyrrolo [2,3-b ]吡啶,收率高。已经提出了形成这些吲哚的可能机理。