Synthesis of Benz[<i>d</i>]oxazolones Involving Concomitant Acetyl Migration from Oxygen to Nitrogen
作者:Sibdas Ray、Sukla Ghosh
DOI:10.1080/00397910903245158
日期:2010.7.27
Heating of o-acetoxybenzoyl azides 6–10 in toluene leads to the Curtius reaction, which, when followed by closure of oxazolone ring with concomitant migration of acetyl group fromoxygen to nitrogen, produces 3-acetoxybenz[d]oxazol-2(3H)-ones 11–15, which undergo hydrolysis with hot dilute hydrochloric acid to furnish benz[d]oxazol-2(3H)-ones 17–21. Thermal reaction of 2-hydroxy-5-nitrobenzoyl azide