Facile and convenient synthesis of functionalized propargylic alcohols and amines: an InBr3–Et3N reagent system promotes the alkynylation of aldehydes and N,O- or N,S-acetals

The use of a novel InBr3–Et3N reagent system to promote the alkynylation of not only a variety of aromatic/heterocyclic or bulky aliphatic aldehydes but also N,O- or N,S-acetals is described. The use of N-silyl-N,O-acetals and 1-alkynes could lead to the direct production of primary propargylic amines in good yields.