A Facile Synthesis of 2-Substituted 2,3-Dihydro-4(1H)-Azuleno[2,1-d]Pyrimidinones

A facile, efficient, and novel approach to access 2-substituted 2,3-dihydro-4(1H)-azuleno[2,1-d]pyrimidinones was developed by condensation of 2-amino-1-carbamoyl-3-phenylazulene with ary1 aldehydes or ketones in ionic liquids by catalyzed p-toluenesulfonic acid.