Synthesis of Two Dipeptide Isosteres Containing Di- and Trisubstituted <i>E</i>-Configured Double Bonds
                                
                                    
                                        作者:Ulrich Koert、Nina Bandur、Klaus Harms                                    
                                    
                                        DOI:10.1055/s-2007-983783
                                    
                                    
                                        日期:2007.9
                                    
                                    stereoselective syntheses of a Tyr-Tyr and a Pro-Pro E-alkene isostere are described. While the Tyr-Tyr isostere was synthesized following a convergent olefination strategy, the trisubstituted E-configured double bond of the Pro-Pro isostere was generated by an Ireland-Claisen rearrangement. The configuration of all key intermediates containing new stereocenters was determined by X-ray crystallography
                                    描述了 Tyr-Tyr 和 Pro-Pro E-烯烃等排体的立体选择性合成。虽然 Tyr-Tyr 等排体是按照会聚烯化策略合成的,但 Pro-Pro 等排体的三取代 E 构型双键是通过 Ireland-Claisen 重排产生的。包含新立体中心的所有关键中间体的构型由 X 射线晶体学确定。