An Efficient Synthesis of 5-Phosphorylated 1,3,2-Diazaphosphinines from β-Functionalized Enamines Derived from Phosphine Oxides and Phosphonates
                                
                                    
                                        作者:Francisco Palacios、Domitila Aparicio、Jesús M. de los Santos、Jesús García                                    
                                    
                                        DOI:10.3987/com-98-s(h)83
                                    
                                    
                                        日期:——
                                    
                                    An easy and efficient synthesis of 1,3,2-P-III-diazaphosphininones (3, 4) substituted with a phosphine oxide or a phosphonate group in the 5-position is described. The key step is a cyclocondensation reaction of substituted beta-enamino amides (1) to phosphorus trichloride and phenylphosphonous dichloride. Subsequent treatment of 1,3,2-P-III-diazaphosphininones (3) with elemental sulfur, water or hydrogen peroxide afforded the substituted 2-thio- (7, 8) and 2-oxo-1,3,2-P-V-diazaphosphininones (5, 6, 9).