One-Pot Eschenmoser Episulfide Contractions in DMSO: Applications to the Synthesis of Fuligocandins A and B and a Number of Vinylogous Amides
                                
                                    
                                        作者:Birgitta Pettersson、Vedran Hasimbegovic、Jan Bergman                                    
                                    
                                        DOI:10.1021/jo101864n
                                    
                                    
                                        日期:2011.3.18
                                    
                                    Practical total syntheses of the natural products fuligocandin A (2a) and fuligocandin B (3) have been achieved through a convergent strategy depending on the Eschenmoser episulfide contraction as a key step. Conducting the reaction in DAIS proved to be an efficient and general method for the synthesis of a variety of vinylogous amides, such as azepan-2-ylidenepropan-2-one.