A novel, low-cost method for the preparation of not easily accessible free 3-aminoindoles has been developed. This approach is based on a well-established reaction between indoles and nitrostyrene in the presence of phosphorous acid, which results in the formation of 4′-phenyl-4′H-spiro[indole-3,5′-isoxazoles]. The latter could be transformed to corresponding aminated indoles by reaction with hydrazine
已开发出一种新颖、低成本的方法来制备不易获得的游离 3-
氨基
吲哚。该方法基于在
亚磷酸存在下
吲哚和硝基
苯乙烯之间已确定的反应,该反应会形成 4'-phenyl-4'H-spiro[indole-3,5'-isoxazoles]。后者可以通过与
水合
肼反应在微波辅助加热下以良好或极好的收率转化为相应的胺化
吲哚。