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A specific tautomer of 1,3-thiazinone and 1,3-oxazinone derivatives were prepared in a one step procedure from condensation of chlorocarbonyl ketenes (CCKs) such as (chlorocarbonyl)phenyl ketene and (chlorocarbonyl)benzyl ketene with thiobenzamide, thioacetamide , cinnamide , benzamide, 2-phenylacetamide and acetamide . This method provides an easy route to prepare 2,5-disubstituted 4-hydroxy-1,3-thiaizin-6-ones and 2, 5-disubstituted 4-hydroxy 1, 3-oxazin-6ones in good to excellent yields in a short experimental time.

A simple and an efficient approach to the synthesis of a special tautomer of 1,3-thiazinones and 1,3-oxazinones