Summary.
3-Oxo-1-pentene-4-ynes were converted with sodium sulfide or hydrogensulfide to give 2,6-disubstituted 2,3-dihydrothiopyran-4-one derivatives. The starting materials were prepared in two steps from terminal alkynes and α,β-unsaturated aldehydes.
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Rosiak, A., Müller, R. & Christoffers, J. Synthesis of 2,3-Dihydrothiopyran-4-ones from 3-Oxo-1-pentene-4-ynes. Monatsh. Chem. 138, 13–26 (2007). https://doi.org/10.1007/s00706-006-0571-4
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DOI: https://doi.org/10.1007/s00706-006-0571-4