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...
Divergent and Stereoselective Synthesis of Tetraarylethylenes from Vinylboronates
作者:Minghao Zhang、Yisen Yao、Peter J. Stang、Wanxiang Zhao
DOI:10.1002/anie.202008113
日期:2020.11.2
elucidated. TAEs have widespread applications in material science and supramolecular chemistry due to their aggregation‐inducedemission (AIE) properties. The divergent and stereoselective synthesis of [3+1]‐, [2+2]‐, and [2+1+1]‐TAEs via multiple couplings of vinylboronates with aryl bromides is demonstrated. These couplings feature a broad substrate scope and excellent functional group compatibility
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)
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
Copper‐Catalyzed Triboration of Terminal Alkynes Using B
<sub>2</sub>
pin
<sub>2</sub>
: Efficient Synthesis of 1,1,2‐Triborylalkenes
作者:Xiaocui Liu、Wenbo Ming、Alexandra Friedrich、Florian Kerner、Todd B. Marder
DOI:10.1002/anie.201908466
日期:2020.1.2
We report herein the catalytic triboration of terminalalkynes with B2 pin2 (bis(pinacolato)diboron) using readily available Cu(OAc)2 and Pn Bu3 . Various 1,1,2-triborylalkenes, a class of compounds that have been demonstrated to be potential matrix metalloproteinase (MMP-2) inhibitors, were obtained directly in moderate to good yields. The process features mild reaction conditions, a broad substrate