Diastereodivergent Hydroxyfluorination of Cyclic and Acyclic Allylic Amines: Synthesis of 4-Deoxy-4-fluorophytosphingosines
作者:Alexander J. Cresswell、Stephen G. Davies、James A. Lee、Melloney J. Morris、Paul M. Roberts、James E. Thomson
DOI:10.1021/jo301056r
日期:2012.9.7
ammonium ion. Regioselective and stereospecificepoxide ring-opening by transfer of fluoride from a BF4– ion (an SN2-type process at the carbon atom distal to the ammonium moiety) then occurs in situ to give the corresponding amino fluorohydrin. Alternatively, an analogous reaction using 20 equiv of HBF4·OEt2 results in preferential epoxidation of the opposite face of the olefin, which is followed by regioselective