Chemoselective Reaction of Benzoylisothiocyanates with Hydroxyl Group of Salicylamide: a New and Convenient Entry Into 2-Aryl-4<i>H</i>-benzo[e][1,3]oxazin-4-ones
作者:Tarjeet Singh、Girija S. Singh、Ram Lakhan
DOI:10.1080/10426507.2012.755974
日期:2013.10.1
Abstract The reactions of benzoylisothiocyanates with salicylamide in pyridine-xylene solution occurs chemoselectively at the hydroxyl group of the salicylamide to afford the corresponding O-benzoyl derivatives. The latter products, on prolonged heating in pyridine-xylene solution, undergo cyclodehydration to give 2-aryl-4H-benzo[e][1,3]oxazin-4-ones in good yields. These compounds could also be synthesized
摘要 在吡啶-二甲苯溶液中,苯甲酰异硫氰酸酯与水杨酰胺在水杨酰胺的羟基上发生化学选择性反应,得到相应的O-苯甲酰衍生物。后一种产物在吡啶-二甲苯溶液中长时间加热后,会发生环脱水反应,以良好的收率得到 2-芳基-4H-苯并[e][1,3]恶嗪-4-酮。这些化合物也可以通过苯甲酰异硫氰酸酯与水杨酰胺的直接一锅反应合成,方法是在回流下将苯甲酰异硫氰酸酯缓慢加入水杨酰胺在二甲苯-吡啶溶液中的溶液中。产品已在令人满意的分析和光谱数据的基础上进行了表征。图形概要