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Synthesis of New Pyrazolo[5,1-c]triazine, Triazolo[5,1-c]triazine, Triazino[4,3-b]indazole and Benzimidazo[2,1-c]triazine Derivatives Incorporating Chromen-2-one Moiety
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 Title & Authors
Synthesis of New Pyrazolo[5,1-c]triazine, Triazolo[5,1-c]triazine, Triazino[4,3-b]indazole and Benzimidazo[2,1-c]triazine Derivatives Incorporating Chromen-2-one Moiety
Khalil, Mohamed A.; Sayed, Samia M.; Raslan, Mohamed A.;
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 Abstract
The versatile, hitherto unreported 3-(4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-yl)-3-oxopropanenitrile 3 was prepared by two convenient routes: either by the reaction of ethyl 4-(2-phenyldiazenyl)-2-oxo-2H-chromen-3-carboxylate 2 with acetonitrile in the presence of sodium hydride or by treatment of 4-(2-phenyldiazenyl)-3-(2-bromoacetyl)-2H-chromen-2- one 5 with potassium cyanide. Reaction of 3 with heterocyclic diazonium salts 6, 7, 14 and 17 furnished the corresponding hydrazones 8, 9, 15 and 18. The latter hydrazones underwent intramolecular cyclization into the corresponding pyrazolo[5,1- c]-1,2,4-triazine 10, 1,2,4-triazolo[5,1-c]-1,2,4-triazine 11, 1,2,4-triazino[4,3-b]indazole 16 and imidazo[2,1-c]-1,2,4-triazine 19 derivatives, respectively upon refluxing in pyridine.
 Keywords
3-Oxopropanenitrile;Pyrazolo[5,1-c]triazine;Triazolo[5,1-c]triazine;Triazino[4,3-b]indazole;Benzimidazo[2,1-c]triazine;
 Language
English
 Cited by
1.
Synthesis and antimicrobial evaluation of some 1,2,4-triazolo[1,5-a]pyridine, pyrimidine sulfonamides and sulfinyl derivatives, European Journal of Chemistry, 2014, 5, 3, 481  crossref(new windwow)
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