Proton‐Promoted Hydroamination of 3‐Dialkylthiomethylene‐1,4‐pentadiynes with<i>o</i>‐Phenylenediamines: A Facile Route to Benzo[<i>b</i>][1,4]diazepines
                                
                                    
                                        作者:Yu‐Long Zhao、Da‐Zhi Li、Xiao‐Dan Han、Li Chen、Qun Liu                                    
                                    
                                        DOI:10.1002/adsc.200700547
                                    
                                    
                                        日期:2008.7.7
                                    
                                    AbstractThe first proton‐promoted intermolecular hydroamination reaction of the enynes, α,α‐dialkynylketene S,S‐acetals 2, is described. A series of benzo[b][1,4]diazepines, with the structures of 3 and 5, were prepared chemo‐ and regioselectively in good to high yields by reacting the readily available 1,4‐diynes 2 with both terminal and internal alkyne functions with o‐phenylenediamines under very mild conditions.