作者:Nicole Holub、Jürgen Neidhöfer、Siegfried Blechert                                    
                                    
                                        DOI:10.1021/ol0474610
                                    
                                    
                                        日期:2005.3.1
                                    
                                    The first enantioselective synthesis of (+)-trans-195A is described. The structure has been constructed by ring-rearrangement metathesis (RRM) and zirconium-mediated Negishi-coupling, used for the first time to prepare 6,6-membered heterocycles, as key steps. By comparison of the synthesized material with the isolated natural product, the absolute configuration of natural trans-195A was determined to be (2R,4aS,5R,8aS)-(-).