Application of directed metalation in synthesis. Part 4: Expedient synthesis of substituted benzo[b]thiophene and naphthothiophene
作者:Chandrani Mukherjee、Sukanta Kamila、Asish De
DOI:10.1016/s0040-4020(03)00710-5
日期:2003.6
inexpensive synthesis of several diversely substituted benzo[b]thiophenes and one naphthothiophene is described. The method involves introduction of methylsulfanyl group ortho- to the amide function of readily available N,N-diethylamides of aryl carboxylic acid by directed metalation. Thioindoxyls, obtained in high yields through side-chain deprotonation and cyclisation in one pot, are reduced to benzo[b]thiophene
描述了几种不同取代的苯并[ b ]噻吩和一个萘噻吩的简短,简单和廉价的合成。该方法涉及通过定向金属化将甲基硫烷基邻位引入容易获得的芳基羧酸的N,N-二乙基酰胺的酰胺官能团。通过在一个罐中通过侧链去质子化和环化以高收率获得的硫吲哚酚被还原为苯并[ b ]噻吩或萘噻吩。