Efficient synthesis of alkylboronic esters <i>via</i> magnetically recoverable copper nanoparticle-catalyzed borylation of alkyl chlorides and bromides
作者:Mahadev L. Shegavi、Abhishek Agarwal、Shubhankar Kumar Bose
DOI:10.1039/d0gc00677g
日期:——
report a magnetically separable Cu nanocatalyst (Fe-DOPA-Cu) for the borylation of alkyl halides with alkoxy diboron reagents, providing alkylboronic esters in high yields, with broad functional group tolerance under mild reaction conditions. The procedure is also applicable to the borylation of benzyl chlorides and bromides. Radical clock experiments support a radical-mediated process. Easy recycling of
Employing anilines as nucleophiles in double carbonylation is a longstanding challenge. In this communication, a Mn(III)-promoted double carbonylation of alkylborates or Hantzsch esters with anilines toward the synthesis of α-ketoamides has been developed. By using easily available potassium alkyltrifluoroborates or Hantzsch esters as the starting material, and cheap and non-toxic Mn(OAc)3 ⋅ 2H2O as
Deaminative Borylation of Aliphatic Amines Enabled by Visible Light Excitation of an Electron Donor-Acceptor Complex
作者:Frederik Sandfort、Felix Strieth-Kalthoff、Felix J. R. Klauck、Michael J. James、Frank Glorius
DOI:10.1002/chem.201804246
日期:2018.11.22
strategy for the borylation of aliphatic primary amines is described. Alkyl radicals derived from the single‐electron reduction of redox‐active pyridinium salts, which can be isolated or generated in situ, were borylated in a visible light‐mediated reaction with bis(catecholato)diboron. No catalyst or further additives were required. The key electron donor–acceptor complex was characterized in detail
Visible-light-driven graphene supported Cu/Pd alloy nanoparticle-catalyzed borylation of alkyl bromides and chlorides in air
作者:Zhi-Feng Jiao、Ya-Ming Tian、Xiao-Ning Guo、Udo Radius、Holger Braunschweig、Todd B. Marder、Xiang-Yun Guo
DOI:10.1016/j.jcat.2021.01.019
日期:2021.3
A highly efficient photocatalytic protocol for borylation of alkyl bromides and chlorides with graphene supported Cu/Pd alloy nanoparticles as a heterogeneous catalyst is reported. This photocatalytic system operates with visible light in air, providing a wide range of primary and secondary alkyl halides with B2pin2 or B2neop2 in high yields at low temperatures, thereby demonstrating its broad utility
Trialkylboranes are readily electrolyzed in acetone solution, containing tetraalkylammonium salts to give corresponding 2-alkyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolanes (1) and 2-alkyl-4,4,6-trimethyl-1,3,2-dioxaborinanes (2) in good yields.