作者:Dominic R. Willcox、Daniel M. De Rosa、Jack Howley、Abigail Levy、Alan Steven、Gary S. Nichol、Carole A. Morrison、Michael J. Cowley、Stephen P. Thomas
DOI:10.1002/anie.202106216
日期:2021.9.13
reactivity at the aluminium hydride centre, switching off hydroalumination and instead enabling selective reactions at the alkyne C−H σ-bond. Chemoselective C−H borylation was observed across a series of aryl- and alkyl-substituted alkynes (21 examples). On the basis of kinetic and density functional theory studies, a mechanism in which C−H borylation proceeds by σ-bondmetathesis between pinacolborane (HBpin)
5 mol%) and DABCO (1 mol%) selectively promotes the dehydrogenative borylation of both aromatic and aliphatic terminalalkynes to afford alkynylboronate derivatives in the presence of 1 equiv. of pinacolborane at 100 °C in toluene. This methodology is applicable to a variety of terminalalkynes (16 examples, yield: 62–93%).