An efficient procedure for the one-pot chemoselective synthesis of 2H-benzo[b][1,4]oxazin-3(4H)-one derivatives from their corresponding o-aminophenols is developed using DBU in the ionicliquid [omim][BF4]. Upon completion of the reaction and separation of the product, the ionicliquid is recovered and successfully reused over nine recycles without any noticeable loss of performance.
在离子液体中使用DBU开发了一种从其相应的邻氨基苯酚一锅化学选择合成2 H-苯并[ b ] [1,4]恶嗪-3(4 H)-one衍生物的有效方法。 [BF 4 ]。反应完成并分离出产物后,将离子液体回收并在9个循环中成功重复使用,而不会造成任何明显的性能损失。