An efficient and clean method has been developed for the synthesis of 2-substituted 2,3-dihydroquinazolin-4(1H)-ones using Amberlyst-15 as a recyclable catalyst. A variety of dihydroquinazolinones were prepared from 2-aminobenzamide and aldehydes under mild conditions in excellent yields. Further structure elaboration of one compound and the crystal structure analysis and hydrogen bonding patterns of the two compounds prepared by using this methodology is presented. (C) 2011 Elsevier Ltd. All rights reserved.
Green protocol for synthesis of 2,3-dihydroquinazolin-4(1H)-ones: lactic acid as catalyst under solvent-free condition
Abstract In the present work, lactic acid was used as novel, green catalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-one derivatives via two distinct methods, including reaction of 2-aminobenzamide with aldehydes/ketones or isatoic anhydride with ammonium acetate and aldehydes in neat condition at 70 °C. The desired products were obtained in satisfactory yields. Short reaction time, easy workup