Catalytic and Highly Efficient 1,4-Addition of Terminal Alkynes to Conjugated Enones by [RuCl2(p-cymene)]2/Pyrrolidine

A wide range of terminal alkynes was added to conjugated enones in a 1,4-fashion by a ruthenium catalyst in the presence of catalytic amounts of an amine base, and the corresponding γ,δ-alkynyl ketones were obtained in good to excellent yields.