Nano TiO2-supported Preyssler-type heteropolyacid (nanoTiO2/H14[NaP5W30O110]): an efficient and re-usable catalyst for the one-pot synthesis of N-acetyl-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones

Abstract

An efficient procedure has been developed for one-pot synthesis of N-acyle-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones in the presence of Preyssler-type heteropolyacid acid modified nano-sized TiO2 as catalyst. The reactions proceed smoothly at 25 °C to afford the products in high yields. The catalyst is easily separated and re-used for the next successive reactions without significant loss of its activity. An efficient procedure has been developed for one-pot synthesis of N-acyle-2-aryl-1,2-dihydro-(4H)-3,1-benzoxazin-4-ones in the presence of Preyssler-type heteropolyacid acid modified nano-sized TiO2 as catalyst. The reactions proceed smoothly at 25 °C to afford the products in high yields. The catalyst is easily separated and re-used for the next successive reactions without significant loss of its activity.