Diastereoselective zirconocene-promoted bicyclization-carbonylation of allylically methyl-substituted enynes. Synthesis of (+)-iridomyrmecin
                                
                                    
                                        作者:Gilbert Agnel、Zbyslaw Owczarczyk、Ei-ichi Negishi                                    
                                    
                                        DOI:10.1016/s0040-4039(00)91669-1
                                    
                                    
                                        日期:1992.3
                                    
                                    Allylically methyl-substituted 1,6-heptenynes, such as 3-methyl-1,6-octenyne, can be diastereoselectively converted to the corresponding bicyclic ketones, such as (5R,6S)-2,6-dimethylbicyclo[3.3.0]oct-1-en-3-one readily convertible to (+)-iridomyrmecin, the observed diastereomeric excesses of the bicyclization reaction being > 90%.