Palladium-Catalyzed Annulation of Allenes with Indole-2-carboxylic Acid Derivatives: Synthesis of Indolo[2,3-<i>c</i>]pyrane-1-ones via Ar–I Reactivity or C–H Functionalization
作者:R. Rama Suresh、K. C. Kumara Swamy
DOI:10.1021/jo301149s
日期:2012.8.17
indolo[2,3-c]pyrane-1-one derivatives through the Pd-catalyzed regioselective annulation of allenes with 3-iodo-1-alkylindole-2-carboxylic acids is described. This method is fairly general for a wide range of allenes affording the respective indolo[2,3-c]pyrane-1-ones in good to excellent yields. In addition, a Pd(II)-catalyzed oxidative coupling of indole-2-caboxylic acid derivatives with allenes via direct
提出了两种方法,一种涉及Ar–I反应性,另一种通过CH–H官能化,用于通过相应的烯键形成吲哚[2,3 - c ]吡喃-1-酮。描述了通过Pd催化的烯丙基与3-碘-1-烷基吲哚-2-羧酸的区域选择性环化制备吲哚并[2,3 - c ]吡喃-1-酮衍生物的高效方法。该方法对于广泛范围的丙二烯是相当普遍的,它们以良好或优异的产率提供了各自的吲哚并[2,3 - c ]吡喃-1-酮。此外,Pd(II)催化吲哚-2-羧酸衍生物与丙二烯的氧化偶合,可通过直接的C–H功能化得到相应的吲哚[2,3- c]。已经开发了中等至良好产率的]吡喃-1-酮。