Oxazaborolidine-Catalyzed Enantioselective Reduction of α-Methylene Ketones to Allylic Alcohols
                                
                                    
                                        作者:Jun-ichi Matsuo、Takaaki Kozai、Osamu Nishikawa、Yu Hattori、Hiroyuki Ishibashi                                    
                                    
                                        DOI:10.1021/jo8011013
                                    
                                    
                                        日期:2008.9.1
                                    
                                    Oxazaborolidine-catalyzed enantioselective reduction of a-methylene ketones was efficiently carried out by using borane-diethylaniline as a stoichiometric reducing agent. The combination of this method and subsequent hydrogenation of thus-formed allylic alcohol improved stereoselectivity in the reduction of 24-oxocholesteryl ester to 24-(R)-hydroxycholesteryl ester.