The chemistry of indoles. XVI. A convenient synthesis of substituted indoles carrying a hydroxy group, a halogeno group, or a carbon side chain at the 4-position via 4-indolediazonium salts and a total synthesis of (.+-.)-6,7-secoagroclavine.
作者:MASANORI SOMEI、MISAO TSUCHIYA
DOI:10.1248/cpb.29.3145
日期:——
Various 4-indolediazonium salts were prepared for the first time by the diazotization of 4-aminoindole derivatives. They underwent various reactions parallel to those of general arene diazonium salts, and were found to be suitable intermediates for the preparation of substituted indoles carrying a hydroxy, halogeno, or cyano group at the 4-position. Attempts to introduce various carbon side chains into the 4-iodoindole derivatives gave satisfactory results and a key intermediate, 4-(3-hydroxy) 3-methyl-1-buten-1-yl) indole, for the synthesis of (±)-6, 7-secoagroclavine was also prepared.
通过对 4-氨基吲哚衍生物进行重氮化,首次制备出了各种 4-吲哚重氮盐。它们经历了与一般炔重氮盐相似的各种反应,并被发现是制备在 4 位上带有羟基、卤代或氰基的取代吲哚的合适中间体。在 4-碘吲哚衍生物中引入各种碳侧链的尝试取得了令人满意的结果,而且还制备出了合成 (±)-6, 7-海泡石碱的关键中间体 4-(3-羟基)3-甲基-1-丁烯-1-基)吲哚。