Synthesis of Functionalized 1,2-Dihydroisoquinolines via Multicomponent One-Pot Reaction of 2-Alkynylbenzaldehyde, Amine, Zinc, and Allylic Bromide or Benzyl Bromide

A multicomponent one-pot reaction of 2-alkynylbenzaldehydes, amines, zinc, and allylic bromide or benzyl bromide using the combination of Mg(ClO4)2/Cu(OTf)2 as catalyst in THF/DCE (1:20) is described, which provides an efficient and practical route for the synthesis of functionalized 1,2-dihydroisoquinolines.