A new protocol has been developed for the borylation of conjugated alkenyl methyl ethers using B2Pin2 via C–O bond cleavage catalyzed by Ni(II). In this cross-coupling reaction, both E/Z isomers of alkenyl ethers are converted into (E)-alkenyl boronic esters with good reactivity. This transformation exhibits high chemoselectivity in the presence of competitive C–O bonds such as aryl ether, ester, amide
Copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids under ligand-free or both ligand- and base-free conditions
作者:Ying-Wei Zhao、Qiang Feng、Qiu-Ling Song
DOI:10.1016/j.cclet.2016.02.012
日期:2016.4
An efficient copper-catalyzed decarboxylative hydroboration of phenylpropiolic acids with bis(pinacolato)diboron was developed, affording β-vinylboronates as the only products in high yields. Extra hydrogen sources such as methanol are not needed in this catalytic system. This reaction could be performed successfully under ligand- and base-free conditions. It demonstrated that phenylpropiolic acids can
Copper-catalyzed Decarboxylative Hydroboration: Synthesis of Vinyl Boronic Esters
作者:Francis Mariaraj Irudayanathan、Gabriel Charles Edwin Raja、Han-Sung Kim、Kyungsu Na、Sunwoo Lee
DOI:10.1002/bkcs.10706
日期:2016.4
Vinyl boronic esters were synthesized from aryl alkynyl carboxylic acids and bis(pinacolato)diboron using a copper‐catalyzed decarboxylative reaction. The reaction was conducted with CuI (10 mol%), bis‐[2‐(diphenylphosphino)phenyl]ether(20 mol%), and LiOMe (20 mol%) in DMSO at 50 °C for 16 h. This method provided the desired vinyl boronic esters in good‐to‐moderate yields and showed good functional
The invention relates to compounds of formula (I) wherein M represents or and T represents a cyclopropyl or cyclobutyl radical as defined in the description. Further, the use of said compounds as antibacterial agents, especially against Gram-negative microorganisms, and methods for manufacturing the same are disclosed.