Ambient Intermolecular [2 + 2] Cycloaddition: An Example of Carbophilicity and Oxophilicity Competition in Au/Ag Catalysis
                                
                                    
                                        作者:Yijin Su、Yanwei Zhang、Novruz G. Akhmedov、Jeffrey L. Petersen、Xiaodong Shi                                    
                                    
                                        DOI:10.1021/ol500854m
                                    
                                    
                                        日期:2014.5.2
                                    
                                    The gold-catalyzed intermolecular [2 + 2] cycloaddition of propargyl esters was achieved with good stereoselectivity. The "silver-free" condition was critical for this transformation, while only a trace amount of [2 + 2] products were formed in the presence of silver under otherwise identical conditions.