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|Title:||A novel catalyst cobalt <i style="">m</i>-nitrobenzenesulfonate-catalyzed highly efficient synthesis of substituted-quinazolin-4(1<i style="">H</i>)-ones|
|Abstract:||A highly efficient synthesis of mono- and disubstituted 2,3-dihydro-quinazolin-4(1<i style="">H</i>)-ones has been performed by the condensation of isatoic anhydride, aldehydes, and ammonium salts or amines in EtOH/H<sub>2</sub>O under reflux. A novel water-tolerant Lewis acid, cobalt <i style="">m</i>-nitrobenzenesulfonate, has been prepared and applied as a favorable catalyst in this one-pot three-component cyclocondensation reaction. The optimal amounts of catalyst and solvent are investigated. Experimental results show that only 3 mol% catalyst is enough to induce the conversion and EtOH/H<sub>2</sub>O [1/3 (v/v)] system is observed as the best choice. All the reactions are performed within a short reaction time and the catalyst is easily recovered and recycled. The structures of new compounds are characterized by IR, <sup>1</sup>H NMR, <sup>13</sup>C NMR, MS and elemental analysis. A mechanism to rationalize the reaction is proposed.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.19(2) [March 2012]|
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