An efficient synthesis of 4-alkyl-2(1H)-quinazolinones and 4-alkyl-2-chloroquinazolines from 1-(2-alkynylphenyl)ureas
作者:Honggen Wang、Lanying Liu、Yong Wang、Changlan Peng、Jiancun Zhang、Qiang Zhu
DOI:10.1016/j.tetlet.2009.09.130
日期:2009.12
An efficient synthesis of 4-alkyl-2(1H)-quinazolinones has been achieved by cyclization of 1-(2-alkynylphenyl)ureas (2 R-2 = alkyl) in dichloroethane catalyzed by TfOH. In the case of aryl substitution (2 R-2 = aryl), a mixture of quinazolinone tautomers is obtained in dichloroethane with TFA as co-solvent. Chlorination of the resulting mixture affords 4-alkyl-2-chloro-quinazolines as sole products. (C) 2009 Elsevier Ltd. All rights reserved.