Total Synthesis of (±)-Streptonigrin: De Novo Construction of a Pentasubstituted Pyridine using Ring-Closing Metathesis
                                
                                    
                                        作者:Timothy J. Donohoe、Christopher R. Jones、Luiz C. A. Barbosa                                    
                                    
                                        DOI:10.1021/ja207835w
                                    
                                    
                                        日期:2011.10.19
                                    
                                    The synthesis of the potent antitumor agent (+/-)-streptonigrin has been achieved in 14 linear steps and 11% overall yield from ethyl glyoxalate. The synthesis features a challenging ring-closing metathesis reaction, followed by elimination and aromatization, to furnish a key pentasubstituted pyridine fragment.