Reactions with alkenes of η2-7-oxotetracarbonylmanganese complexes derived from diterpenoids
                                
                                    
                                        作者:Richard C. Cambie、Michael R. Metzler、Peter S. Rutledge、Paul D. Woodgate                                    
                                    
                                        DOI:10.1016/0022-328x(92)83318-c
                                    
                                    
                                        日期:1992.5
                                    
                                    A number of activated 7-oxotetracarbonylmanganese(I) complexes derived from podocarpic acid (1) and from dehydroabietic acid have been coupled with alkenes to give C(14) functionalised derivatives in high yields. Some coupling reactions resulted in cyclization to C(7), forming 4H-acephenanthrylene derivatives in moderate yields. Several modes of activating these manganese complexes towards coupling reactions were investigated; these included oxidative decarbonylation at room temperature, thermal promotion, and palladium-mediation.