LiBr catalyzed solvent-free ring expansion of epoxides to 1,4-oxathian-2-ones with α-mercaptocarboxylic acids
作者:Atul K. Singh、Ankita Rai、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2011.05.010
日期:2011.7
An efficient and rapid (10–20 min) one-pot synthesis of chemically and pharmaceutically interesting 1,4-oxathian-2-ones is reported. The protocol involves LiBr catalyzed regioselective ring-opening–ring-closing reaction cascade of terminal epoxides with α-mercaptocarboxylic acids at rt under solvent-free conditions. Recycling of the catalyst, atom economy, and formation of water as the only by-product