Abdullah AH, Zahra JA, Sabri SS, Awwadi FF, Hussein AQ, El-Abadelah MM. Thiophene ring-opening reactions VI. Attempted cyclization towards [fused]-tricyclic system involving a thiolate anion and suitably located electrophilic carbon.
Z NATURFORSCH C 2023;
78:133-140. [PMID:
35934877 DOI:
10.1515/znc-2022-0080]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Accepted: 07/18/2022] [Indexed: 11/15/2022]
Abstract
Model α-chloro-β-nitrothieno[2,3-c]pyridazines incorporating N1-(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 NEt3, 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.
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