An efficient synthesis of naphtha[1,2-e]oxazinone and 14-substituted-14H-dibenzo[a,j]xanthene derivatives promoted by zinc oxide nanoparticle under thermal and solvent-free conditions

A general synthetic route to the synthesis of 1,2-dihydro-1-arylnaphthol[1,2-e][1,3]oxazine-3-one and 14-substituted-14H-dibenzo[a,j]xanthenes derivatives has been developed using ZnO-NPs under thermal and solvent-free conditions. The union of 2-naphthol, aldehyde, urea enabling the synthesis of naphtho[1,2-e][1,3]oxazinone and 2-naphthol, aldehyde gave dibenzo[a,j]xanthenes in excellent yields. This method provides several advantages like simple work-up, environmentally benign, and shorter reaction times along with high yields. (C) 2012 Elsevier Ltd. All rights reserved.