An Approach to the Construction of Benzofuran-thieno[3,2-b]indole-Cored N,O,S-Heteroacenes Using Fischer Indolization

Green methodologies for the synthesis of 2-aminothiophene

Pollution and the rising energy demand have prompted the design of new synthetic reactions that meet the principles of green chemistry. In particular, alternative synthesis of 2-aminothiophene have recently focused interest because 2-aminothiophene is a unique 5-membered S-heterocycle and a pharmacophore providing antiprotozoal, antiproliferative, antiviral, antibacterial or antifungal properties. Here, we review new synthetic routes to 2-aminothiophenes, including multicomponent reactions, homogeneously- or heterogeneously-catalyzed reactions, with focus on green pathways.

Facile Access to α-Substituted β-Thio Enals from 1,2,3-Triazines and Thiols

Herein, a chemoselective cascade addition reaction is reported, which starts from 1,2,3-triazines and thiols to access several different α-substituted β-thio enals and their derivatives in a green and efficient synthesis. In terms of applications, readily available substrates, diversity of products, and mild reaction system make this strategy highly attractive.