Abstract
Abstract Upon acetylation, (2-phenyl)dihydrobenzopyrone- and 2′-hydroxychalcone thiosemicarbazones (1c, 2c, 3c, and 7c) form 2,2-disubstituted 5-acetamido-3-acetyl-2,3-dihydro-1,3,4-thiadiazoles (1i, 2i, 4i, and 8i) instead of the diacetylthiosemicarbazones (2e, 8e) claimed in the literature. Similarly, the reactions of the aromatic ketone thiosemicarbazones 9c, 10c and 11d result in the formation of thiadiazolines (9i, 10i, and 11k, respectively), flavone thiosemicarbazone (6c), however, is degraded to flavone diacetylhydrazone (6g) under the same conditions. The synthesis of the flavanone spiro-1,3,4-oxadiazoline 2h is also described.
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