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An efficient approach for the synthesis of functionalized tetrahydro-4H-chromenes 3a-c and tetrahydro-4H-thiopyran 3d-e derivatives moderate to high yields have been achieved via a addition-cyclization reaction of α, β-Unsaturated cyanoesters 1a-c with dimedone 2p or 1, 3-cyclohexandione 2q in presence of sodium ethoxide and Benzaldehyde with 2-propanol in presence of ammonium sulphide respectively. This methodology differs from the previous classical methods in its simplicity and ready availability of the catalyst. The structures of the compounds 3a-e were confirmed by their ultraviolet, infrared, H NMR, C NMR and elemental analyses.

A One-Pot Synthesis of Functionalized Tetrahydro-4HChromenes and Tetrahydro-4H-Thiopyrans Derivatives