作者:Wei Zhang、Suqing Zheng、Na Liu、Jenny B. Werness、Ilia A. Guzei、Weiping Tang                                    
                                    
                                        DOI:10.1021/ja100173w
                                    
                                    
                                        日期:2010.3.24
                                    
                                    A catalytic enantioselective syn-1,4-bromolactonization of conjugated (Z)-enynes was reported. Diastereomeric ratios >20:1 and up to 99% enantiomeric excesses were observed. Di-, tri-, and tetra-substituted bromoallenes were prepared together with lactone heterocycles efficiently and stereoselectively, Preliminary investigations Suggest that the chiral catalyst may serve as a bifunctional reagent by interacting with both a carboxylic acid nucleophile and NBS electrophile.