Low-Coordinate NHC–Zinc Hydride Complexes Catalyze Alkyne C–H Borylation and Hydroboration Using Pinacolborane
作者:Richard J. Procter、Marina Uzelac、Jessica Cid、Philip J. Rushworth、Michael J. Ingleson
DOI:10.1021/acscatal.9b01370
日期:2019.6.7
DFT calculations all support mechanisms involving organozinc species that undergo metathesis with HBPin. Furthermore, zinc-catalyzed hydroboration can proceed via a hydrozincation step, which does not require any exogenous catalyst in contrast to all previously reported alkyne hydrozincations. Bulky N-heterocyclic carbenes (NHCs) are key for effective catalysis as the NHCsteric bulk enhances the stability
Ag(I)-catalyzed C–H borylation of terminal alkynes
作者:Jiu-Rong Hu、Lin-Hai Liu、Xin Hu、Hong-De Ye
DOI:10.1016/j.tet.2014.06.033
日期:2014.9
An efficient Ag(I)-catalyzed borylation method of terminal alkynes is reported. The obtained borylated alkynes are shown to engage in C-Br, C-CN, C-N, and C-C bond formation with various reaction partners. Meanwhile the Ag(I) catalyst could be regenerated in the presence of PPh3 and BF3. (C) 2014 Elsevier Ltd. All rights reserved.
The Pauson–Khand reaction using alkynylboronic esters: solving a long-standing regioselectivity issue
作者:Thierry León、Elena Fernández
DOI:10.1039/c6cc04717c
日期:——
The first intermolecularPauson-Khandreaction conducted with internal alkynylboronic esters has been described. This strategy allows the installation of the boronic ester moiety in b-position of the cyclopentenone with total...