Facile Route for the Synthesis of Pyridazine Derivatives: Unexpected Pathway to Benzothiazole, Benzimidazole, and Triazole Derivatives
作者:Eman A. El Rady
DOI:10.1080/00397910500328845
日期:2006.2
4-Amino-5-arylmethylidene-3-phenyl-pyridazin-6-ones 7 have been synthesized and reacted with selected nucleophile reagents such as phenyl hydrazine, semicarbazide, semithiocarbazide, cyanoacetohydrazide, 2-aminothiophenol, and 2-phenylenediamine in ethanol triethyl-amine solution. An unexpected 1-phenyl-3-arylaziridene 10, 3-aryl-5-oxo(thio)-1,2,4-triazole 21, 4-amino-3-aryl-6-hydroxy-pridazine 27, 2-arylbenzothiazole 30a-c, and 2-arylbenzimidazole 30d-f have been obtained, respectively. Also, 2-aminothiophenol and 2-phenylenediamine were reacted with N -phenylmethylidene-2-cyanoacetohydrazide 2, affording the new 1,4-benzodiazepine derivatives 35.