An efficient synthesis of fused polycyclic indole derivatives via Aldol-Hetero Diels-Alder reaction of α,β-Unsaturated Thio-oxindoles with various dienophiles

Abstract

An efficient and one-pot synthesis of thiopyrano[2,3-b]indole derivatives via Hetero Diels-Alder reaction of α,β-Unsaturated thio-oxindoles with electron poor acetylenes and Cyclic Dienophiles is described. In the proposed method the reaction is performed under neutral and one-pot reaction conditions, and also the substances can be mixed without any activation or modification and without using any catalysts.