Synthesis of the Louisianin Alkaloid Family via a 1,2,4-Triazine Inverse-Electron-Demand Diels−Alder Approach
                                
                                    
                                        作者:Nicola Catozzi、Michael G. Edwards、Steven A. Raw、Pierre Wasnaire、Richard J. K. Taylor                                    
                                    
                                        DOI:10.1021/jo901761r
                                    
                                    
                                        日期:2009.11.6
                                    
                                    Isolated in 1995, the four members of the louisianin family (A, B, C and D) are simple pyridine and 2-pyridone alkaloids that display both antibacterial and anticancer activity. Herein we describe the synthesis of all four members of the louisianin family, from I conveniently prepared 1,2,4-triazine and via I common tetrasubstituted pyridine intermediate. This study includes the synthesis of louisianin B in both racemic form and is the (-)-enantiomer.