An Efficient, One-Pot, Green Synthesis of Tetracyclic Imidazo[2,1-b]Thiazoles via Electrochemically Induced Tandem Heteroannulation Reactions

[摘要]：A series of novel catechol-fused tetracyclic compounds, with an imidazo[2,1-b]thiazole central core, were successfully synthesized through the anodic oxidation of catechols in the presence of 2-mercaptobenzimidazole in aqueous solution. The cyclic voltammetric results indicate that a one-pot four-step sequential reaction occurs between 2-mercaptobenzimidazole and the electrochemically derived o-benzoquinones affording fused polyheterocyclic compounds. The mechanism of this catalyst-free, domino reaction is proved as an ECEC pathway using controlled-potential coulometry. In addition, the electrosyntheses of fused compounds have been successfully performed in ambient conditions in an undivided cell using an environmentally friendly method with high atom economy. The structures of products were characterized by FT-IR, 1H NMR, 13C NMR, and HRMS spectrometric methods.

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