Asymmetric epoxidations and kinetic resolutions of δ-hydroxy allylic phosphine oxides
                                
                                    
                                        作者:Jonathan Clayden、Eric W. Collington、Stuart Warren                                    
                                    
                                        DOI:10.1016/s0040-4039(00)60928-0
                                    
                                    
                                        日期:1992.11
                                    
                                    Delta-Hydroxy allylic phosphine oxides 5 undergo asymmetric epoxidation to yield epoxy alcohols 6 with high enantio- and diastereoselectivity. Kinetic resolutions are also successful, even with a chiral centre remote from the allylic hydroxyl, if that chiral centre bears a diphenylphosphinoyl group. The diphenylphosphinoyl group then exerts a novel anti-directing effect on the epoxidation.