One-Pot Transition-Metal-Free Synthesis of Weinreb Amides Directly from Carboxylic Acids
作者:Danfeng Huang、Yulai Hu、Teng Niu、Ke-Hu Wang、Changming Xu、Yingpeng Su、Ying Fu
DOI:10.1055/s-0033-1340317
日期:——
directly from carboxylic acids, N,O-dimethylhydroxylamine, and phosphorus trichloride in one pot at 60 °C in toluene in high yields, thus avoiding the separation of the moisture and air sensitive intermediate P[NMe(OMe)]3 in advance. Sterically hindered carboxylic acids also give the corresponding Weinreb amides in excellent yields. Various functional groups are tolerated on the carboxylic acid. The method
摘要 在一个锅中于60°C在甲苯中以高收率直接由羧酸,N,O-二甲基羟胺和三氯化磷直接制备Weinreb酰胺,从而避免了对水分和空气敏感的中间体P [NMe(OMe)] 3的分离。提前。受位阻的羧酸也以优异的产率得到相应的Weinreb酰胺。羧酸上具有各种官能团。该方法工艺简单,收率高,适合大规模生产。 在一个锅中于60°C在甲苯中以高收率直接由羧酸,N,O-二甲基羟胺和三氯化磷直接制备Weinreb酰胺,从而避免了对水分和空气敏感的中间体P [NMe(OMe)] 3的分离。提前。受位阻的羧酸也以优异的产率得到相应的Weinreb酰胺。羧酸上具有各种官能团。该方法工艺简单,收率高,适合大规模生产。