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A selected set of new 4 H -benzothiopyran-4-one derivatives  6a–h  has been prepared by a one-pot reaction involving deprotonated methyl 3-oxo-3(2′,4′,5′-trichlorophenyl)propanoate  5  and the appropriate aryl or alkyl isothiocyanate. 2,4,5-Trichloroacetophenone  4 , required for the synthesis of  5 , is successfully prepared by Friedel–Craft’s acetylation of 1,2,4-trichlorobenzene in 82% yield. The structures of the new compounds  5  and  6a–h  are based on microanalytical and spectral (NMR, MS(EI), and HRMS) data.

Fused thia-heterocycles via isothiocyanates. Part I. Facile synthesis of some new 1-benzothiopyran- 4-one derivatives