Catalyst-free and solvent-free hydroboration of alkynes
作者:Ashok Kumar Jaladi、Hyeon Seong Choi、Duk Keun An
DOI:10.1039/d0nj02612c
日期:——
The hydroboration of alkynes with pinacolborane (HBpin) under catalyst- and solvent-free conditions was demonstrated. Various alkynes were smoothly converted into alkenyl boronate esters in good to excellent yields at 110 °C. The gram-scale hydroboration of alkynes provided the corresponding boronates, which were further utilized for various chemical transformations and coupling reactions.
Zinc‐Catalysed Hydroboration of Terminal and Internal Alkynes
作者:Souvik Mandal、Sayantan Mandal、K. Geetharani
DOI:10.1002/asia.201900839
日期:2019.12.13
A regioselective hydroboration of alkynes has been developed by using commercially available zinc triflate as a catalyst, in the presence of catalytic amount of NaBHEt3 . The reaction tolerates a wide range of terminalalkynes having several synthetically useful functional groups and proceeds regioselectively to furnish hydroborated products in moderate to excellent yields. This system shows moderate
Solvent-free hydroboration of alkynes catalyzed by an NHC–cobalt complex
作者:Małgorzata Bołt、Patrycja Żak
DOI:10.1039/d2ra03005e
日期:——
A new cobalt complex bearing a bulky N-heterocyclic carbene (NHC) ligand is described as a pre-catalyst for alkyne hydroboration. The proposed catalytic system, synthesized using easily accessible reagents, allowed obtaining a series of mono- and dialkenylboranes in solvent-free conditions with excellent efficiency and selectivity. The results have been compared to those obtained in the presence of