An efficient and facile synthesis of new tetracyclic fused pyrazolo[4,3-<Emphasis Type="Italic">c</Emphasis>][1,2,4]triazino[4,5-<Emphasis Type="Italic">a</Emphasis>]quinolin-4(5<Emphasis Type="Italic">H</Emphasis>)-ones |
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Authors: | Mohsen A-M Gomaa Huda A Ali |
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Institution: | 1.Department of Chemistry, Faculty of Science,Minia University,El-Minia,Egypt |
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Abstract: | Reaction of amidrazones 1a–1i with (1,5-dihydro-3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-ylidene)propanedinitrile (2) in ethyl acetate solution in one-step reaction led to the formation of unprecedented pyrazolo4,3-c]1,2,4]triazino4,5-a]quinolin-4(5H)-ones 3a–3g along with pyrazolo4,3-c]1,2,4]triazino4,5-a]quinolin-12b-oles 3h–3m in moderate to excellent yields. These novel heterocycles were formed via a Michael addition reaction followed by intramolecular cyclization via a dearomatization process. |
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