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An organocatalyzed highly regioselective synthesis of substituted tetrahydrobenzofuran-4-ones based on the ring opening followed by cyclization of epoxides with enamines of 1,3-cyclohexanediones in a domino fashion is described. It is a high yielding (74–93%) synthetic protocol tolerant to a wide range of substrates. Ambient temperature, organocatalytic approach, atom-economy, and formation of water...
An efficient and rapid (10–20min) 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...
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