A Highly Regio- and Stereoselective Synthesis of α-Fluorinated Imides via Fluorination of Chiral Enamides
作者:Yan-Shuang Xu、Yu Tang、He-Jing Feng、Ji-Tian Liu、Richard P. Hsung
DOI:10.1021/ol503591d
日期:2015.2.6
A highly π-facial selective and regioselective fluorination of chiral enamides is described. The reaction involves an enantioselective fluorination exclusively at the electron-rich enamide olefin with N–F reagents such as Selectfluor and N-fluoro-benzenesulfonimide [NFSI] accompanied by trapping of the β-fluoro-iminium cationic intermediate with water. The resulting N,O-hemiacetal could be oxidized
描述了手性烯酰胺的高度π面选择性和区域选择性氟化。该反应涉及使用 N-F 试剂(例如 Selectflu 和N-氟苯磺酰亚胺 [NFSI] )仅在富电子烯酰胺烯烃上进行对映选择性氟化,同时用水捕获 β-氟亚胺阳离子中间体。所得的N,O -半缩醛可以使用戴斯-马丁高碘烷氧化,从而产生用于合成手性 α-氟酰亚胺和光学富集的 α-氟酮的不对称序列。