β,β-Disubstituted <i>C</i>- and <i>N</i>-Vinylindoles from One-Step Condensations of Aldehydes and Indole Derivatives
作者:Gil Fridkin、Nicolas Boutard、William D. Lubell
DOI:10.1021/jo900526p
日期:2009.8.7
Direct preparation of β,β-disubstituted C- and N-vinylindoles from condensation of aldehydes on indole derivatives is presented. Heating 1-methyl- and 1-benzylindole 3a,b with alkyl and aryl α-branched aldehydes and TFA in acetonitrile using microwave irradiation furnished 3-vinylindoles 1a−e in 18−76% yields. Under similar conditions, 3-substituted indoles 4a−c provided N-vinylindoles 2a−h in 16−98%
提出了由醛在吲哚衍生物上的缩合直接制备β,β-二取代的C-和N-乙烯基吲哚的方法。使用微波辐射,将1-甲基和1-苄基吲哚3a,b与烷基和芳基α-支化醛以及TFA在乙腈中加热,以18-76%的收率得到3-乙烯基吲哚1a - e。在相似的条件下,3-取代的吲哚4a - c以16-98%的产率提供了N-乙烯基吲哚2a - h。