Synthesis of 4,5,6,7-Tetrahydro-1<i>H</i>-indole Derivatives Through Successive Sonogashira Coupling/Pd-Mediated 5-<i>endo</i>-<i>dig</i>Cyclization
作者:Ivan A. Andreev、Dmitry S. Belov、Alexander V. Kurkin、Marina A. Yurovskaya
DOI:10.1002/ejoc.201201417
日期:2013.2
A one-pot Sonogashira cross-coupling/5-endo-dig cyclization procedure leading to 2-aryl-4,5,6,7-tetrahydroindoles was developed. This short (only two steps from commercially available compounds) sequence avoids harsh conditions and expensive catalysts. Our procedure is highly tolerant to a range of functional groups (amino, nitro, carboxy, cyano, hydroxy, and bromo). A family of 21 tetrahydroindoles
开发了导致 2-芳基-4,5,6,7-四氢吲哚的一锅 Sonogashira 交叉偶联/5-endo-dig 环化程序。这种短(仅从市售化合物中提取两个步骤)序列避免了苛刻的条件和昂贵的催化剂。我们的程序对一系列官能团(氨基、硝基、羧基、氰基、羟基和溴)具有高度耐受性。以克级规模合成了 21 种四氢吲哚家族,产率良好至极好,这表明该反应的一般特征和可扩展性。这种方法允许在 C2 位置(通过 ArI 的变化)和氮原子(通过 RNH2 的变化,包括手性部分)获得带有杂项取代基的吲哚。