摘要:
Intramolecular heterocyclization of thiosemicarbazones derived from saturated and conjugated beta-amino ketones afforded previously unknown dihydro-1,3,4-thiadiazole derivatives. A probable scheme of the transformation of multicenter intermediate includes generation and intramolecular cyclization of a thiol thiosemicarbazone tautomer without participation of conjugated double carbon-carbon bond in the substrate.