A concise, regiocontrolled route to isoxazoles, based on the condensation of an ester with a metallated imine, has been developed. The intermediate vinylogous amides react smoothly with hydroxylamine to provide, after dehydration, substituted isoxazoles. The method has been used for the multi-kilo scale preparation of ABT-418, a novel cholinergic channel activator.
已开发出一种简明的区域选择性合成
异噁唑的路线,该方法基于酯与
金属化
亚胺的缩合。中间体连
氨酰胺与
羟胺反应顺利,经过脱
水后,生成取代的
异噁唑。该方法已用于ABT-418的多千克规模制备,ABT-418是一种新型的
胆碱能通道激活剂。