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Model  α -chloro- β -nitrothieno[2,3- c ]pyridazines incorporating  N 1-(aryl) entity appended with  ortho -methoxycarbonyl or trifluoromethyl group were prepared  via  intramolecular cyclization of their respective  N -arylhydrazone precursors. Interaction of these substrates with  N ′-( p -fluorophenyl)benzothiohydrazide, in the presence of NEt 3 , furnished the respective 1,3,4-thiadiazoline–pyridazine thiolate hybrids that were  S -methylated to produce the corresponding “sulfanyl” derivatives. Their structures were deduced from spectral data, and confirmed by single-crystal X-ray diffraction.

zeitschrift für naturforschung c

Thiophene ring-opening reactions VI. Attempted cyclization towards [fused]-tricyclic system involving a thiolate anion and suitably located electrophilic carbon