Enantioselective Copper-Catalyzed Intramolecular O−H Insertion: An Efficient Approach to Chiral 2-Carboxy Cyclic Ethers
                                
                                    
                                        作者:Shou-Fei Zhu、Xiao-Guang Song、Yu Li、Yan Cai、Qi-Lin Zhou                                    
                                    
                                        DOI:10.1021/ja1078464
                                    
                                    
                                        日期:2010.11.24
                                    
                                    A copper-catalyzed asymmetric intramolecular O-H insertion of omega-hydroxy-alpha-diazoesters has been accomplished by using chiral spiro bisoxazoline ligands. This highly enantioselective intramolecular O-H insertion reaction provides an efficient approach to a variety of synthetically important chiral 2-carboxy cyclic ethers with different ring sizes as well as substitution patterns.