Lewis-base-catalysed selective reductions of ynones with a mild hydride donor

Chem Commun (Camb). 2018 Mar 27;54(26):3266-3269. doi: 10.1039/c8cc00058a.

Abstract

Ynones are efficiently reduced with a mild hydride donor in the presence of a catalytic amount of nucleophilic phosphines. The reactions are selective 1,2-reductions that give propargyl alcohols in yields of up to 96%. It is proposed that success in these reactions depends on the activation of ynones by a Lewis base catalyst. A protic additive plays a key role in suppressing the undesired reaction pathways and accelerating the 1,2-reductions.