Enantioselective Synthesis of 10-<i>e</i><i>pi</i>-Anamarine via an Iterative Dihydroxylation Sequence
                                
                                    
                                        作者:Dong Gao、George A. O'Doherty                                    
                                    
                                        DOI:10.1021/ol047322i
                                    
                                    
                                        日期:2005.3.1
                                    
                                    The enantioselective syntheses of 10-epi-anamarine and 5,10-epi,epi-anamarine have been achieved in 13 to 14 steps. The route relies upon an enantio- and regioselective Sharpless dihydroxylation of either dienoates or trienoates to establish the C-8 to C-11 stereochemistry. A diastereoselective Leighton allylation established the desired C-5 stereochemistry. The route also relies upon a ring-closing metathesis to establish the alpha,beta-unsaturated lactones.