Total Synthesis of the Cyclopeptide Alkaloid Paliurine E. Insights into Macrocyclization by Ene−Enamide RCM
                                
                                    
                                        作者:Mathieu Toumi、François Couty、Gwilherm Evano                                    
                                    
                                        DOI:10.1021/jo702092x
                                    
                                    
                                        日期:2008.2.1
                                    
                                    The total synthesis of (−)-paliurine E is described in 14 steps and 11% overall yield. The first successful application of ene−enamide ring-closing metathesis for macrocyclization serves as the foundation for this synthesis and allowed for a straightforward installation of the challenging cyclic enamide together with the macrocycle. In the course of these synthetic studies, we also found that very
                                    (-)-paliurine E的总合成描述为14个步骤,总产率为11%。烯-酰胺闭环复分解在大环化中的首次成功应用为该合成奠定了基础,并允许将具有挑战性的环烯酰胺与大环一起直接安装。在这些合成研究的过程中,我们还发现烯酰胺的非常细微和轻微的结构修饰导致它们的反应性发生戏剧性和出乎意料的变化,因为在与Grubbs的第二代催化剂反应后可以得到伯酰胺或芳香醛。还讨论了通过烯酰胺RCM进行大环化的更多见解。