Chemoselective C(sp)–H borylation of terminal alkynes catalyzed by a bis(N-heterocyclicsilylene) manganese complex

Abstract

The manganese(II) complex [Mn(SiNSi)Cl₂] (SiNSi = 2,6-[EtNSi(NtBu)₂CPh]₂C₅H₃N) is an efficient catalyst for the chemoselective C(sp)–H borylation of terminal alkynes. Aliphatic and aromatic alkynes with different substituents have been efficiently borylated. Mechanistic studies indicate that the precatalyst enters the cycle by reaction with HBPin (Pin = pinacolate), which plays a key role in enabling a high chemoselective process.