A straightforward approach for the synthesis of novel fused thiopyrano [2, 3-b] indole derivatives from the Intramolecular Friedel-Crafts acylation
作者:Salman Taheri、Ali Asghar Mohammadi、Reza Ahdenov、Robab Azarlak、Saeed K. Amini、Mohammad Reza Halvagar
DOI:10.1016/j.molstruc.2020.127854
日期:2020.5
regioselective synthesis of fused thiopyrano [2,3-b]indole-2-carboxylates using Eaton’s reagent (P2O5/MeSO3H) as an inexpensive, and easily available catalyst is developed under solvent-free condition at 80C. The reaction of various acetylenecarboxylates and indoline-2-(3H)-thiones using Eaton’s reagent affords fused indole heterocyclic compounds in good to excellent yields. This new method Compared
摘要 在这项研究中,使用伊顿试剂 (P2O5/MeSO3H) 作为一种廉价且易于获得的催化剂,在溶剂下开发了一种简便有效的稠合噻喃 [2,3-b] 吲哚-2-羧酸盐的区域选择性合成方案。 80°C 时的自由状态。各种乙炔羧酸盐和二氢吲哚-2-(3H)-硫酮使用伊顿试剂进行反应,以良好至极好的收率提供稠合吲哚杂环化合物。与分子内Friedel-Crafts酰化相比,这种新方法具有反应时间短、区域选择性和易于产物分离的优点。