Convenient synthesis of 6,7-dihydroazolo[5,1-b]quinazolin-8(5H)-one derivatives |
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Authors: | A A Petrov A N Kasatochkin |
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Institution: | 1. St. Petersburg State University, Universitetskii pr. 26, St. Petersburg, 198504, Russia
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Abstract: | Three-component condensation of 3(5)-aminoazoles with benzaldehydes and dimedone in acetonitrile in the presence of montmorillonite KSF as heterogeneous catalyst regioselectively afforded 5,6,7,9-tetrahydroazolo5,1-b]quinazolin-8(4H)-one derivatives in good yields. Oxidation of the condensation products with ceric ammonium nitrate in acetone gave the corresponding 6,7-dihydroazolo5,1-b]quinazolin-8(5H)-ones. |
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