Proton‐Promoted Hydroamination of 3‐Dialkylthiomethylene‐1,4‐pentadiynes witho‐Phenylenediamines: A Facile Route to Benzo[b][1,4]diazepines
摘要:
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.
Abstract A novel and efficient copper(I)-catalyzed three-component Huisgen cycloaddition reaction of conjugated enynes, alkyl halides, and sodium azide has been developed. These reactions were performed in the absence of amide ligands at room temperature, and the corresponding mono- and bis-1,2,3-triazoles were obtained in good to excellent yields in a one-pot procedure. Supplemental materials are