Urea/Thiourea as Ammonia Surrogate: A Catalyst-Free Synthesis of 2-Substituted 2,3-Dihydroquinazolin-4(1<i>H</i>)-ones/Quinazoline-4(3<i>H</i>)-ones
作者:P. Paradesi Naidu、Akula Raghunadh、K. Raghavendra Rao、Ramamohan Mekala、J. Moses Babu、B. R. Rao、V. Siddaiah、Manojit Pal
DOI:10.1080/00397911.2013.862551
日期:2014.5.19
ammonia surrogate in the construction of quinazolin-4(3H)-one ring. This strategy afforded a simple and catalyst-free synthesis of 2-substituted 2,3-dihydroquinazolin-4(1H)-ones and quinazolin-4(3H)-ones via the reaction of isatoic anhydride and aryl aldehydes in the presence of urea or thiourea in ethanol. The reaction proceeded well to afford the quinazolin-4(3H)-one or its dihydro derivative, depending