Synthesis of 2-Alkenyl- and 2-Alkynyl-benzo[<i>b</i>]phospholes by Using Palladium-Catalyzed Cross-Coupling Reactions
                                
                                    
                                        作者:Yoshihiro Matano、Yukiko Hayashi、Kayo Suda、Yoshifumi Kimura、Hiroshi Imahori                                    
                                    
                                        DOI:10.1021/ol401994e
                                    
                                    
                                        日期:2013.9.6
                                    
                                    Heck, Stille, and Sonogashira reactions of 2-bromobenzo[b]phosphole P-oxide afforded a series of 2-alkenyl- and 2-alkynyl-benzo[b]phosphole P-oxides. The charge-transfer character of the new benzo[b]phosphole pi-systems in the excited state is enhanced by the terminal electron-donating substituents. Furthermore, the C-Sn cross-coupling of the bromide was applied to the facile synthesis of a new Stille-coupling precursor, 2-stannylbenzo[b]phosphole.