Formation of 1-(2-aminophenyl)-5-ethoxy-4-methyl-3-phenylpyrazole and 4-methyl-3-phenylpyrazolo-[5,1-b]benzimidazole via an unusual enzotriazole ring opening |
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| Authors: | Alan R. Katritzky Zuoquan Wang Hengyuan Lang Peter J. Steel |
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| Affiliation: | (1) Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, 32611-7200 Gainesville, FL;(2) Department of Chemistry, University of Canterbury, Christchurch, New Zealand |
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| Abstract: | Successive treatment of N-[(1-ethoxy)alken-2-yl]benzotriazoles VII with butyllithium and trimethylsilyl chloride in TH-Fat — 78°C followed by refluxing in acidic acetone generated ring-opened 1-(2-aminophenyl)-5-ethoxy-4-methyl-3 phenylpyrazole VIII and 4-methyl-3 phenylpyrazolo[5, 1-b]benzimidazole IX.Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 775–780, June, 1996. Original article submitted May 14, 1996. |
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