Asymmetric syntheses of a GPR40 receptor agonist via diastereoselective and enantioselective conjugate alkynylation
                                
                                    
                                        作者:Jacqueline C.S. Woo、Sheng Cui、Shawn D. Walker、Margaret M. Faul                                    
                                    
                                        DOI:10.1016/j.tet.2010.04.019
                                    
                                    
                                        日期:2010.6
                                    
                                    Two asymmetric methods to synthesize a potent GPR40 receptor agonist are reported. Both synthetic routes utilize readily available, inexpensive starting materials and reagents. The first route relies on a highly diastereoselective conjugate alkynylation of an ephedrine-derived oxazepanedione acceptor. The second route features the enantioselective alkynylation of a Meldrum's acid-derived acceptor mediated by a chiral zinc cinchonidine reagent. (C) 2010 Elsevier Ltd. All rights reserved.