Brønsted acid-catalyzed metal-free one-pot synthesis of benzimidazoles via [4+1] heteroannulation of ortho-phenylenediamines with β-oxodithioesters
作者:Abhijeet Srivastava、Gaurav Shukla、Dhananjay Yadav、Maya Shankar Singh
DOI:10.24820/ark.5550190.p010.069
日期:——
operationally simple and user-friendly one-pot domino protocol for the synthesis of 2-aryl/hetaryl benzimidazoles has been devised from easily available and inexpensive 1,2-phenylenediamines and βoxodithioesters. The strategic [4+1] heteroannulation initiated by Brønsted acid PTSA relies on remarkable domino sequence of condensation, cyclization, and elimination. The current approach enables N-H/N-H functionalization
一种操作简单且用户友好的单锅多米诺骨牌协议,用于合成 2-芳基/杂芳基苯并咪唑,由易于获得且价格低廉的 1,2-苯二胺和 β-氧代二硫酯设计而成。由 Brønsted 酸 PTSA 引发的战略性 [4+1] 杂环化依赖于显着的缩合、环化和消除的多米诺骨牌序列。目前的方法可以在无溶剂和无金属条件下实现 NH/NH 功能化,从而产生多种苯并咪唑。反应顺利进行,以良好到极好的收率提供所需的产物,表现出克级能力和广泛的官能团耐受性。值得注意的是,该方法具有高度的化学和区域选择性。