Visible Light-Induced Borylation of C–O, C–N, and C–X Bonds
作者:Shengfei Jin、Hang. T. Dang、Graham C. Haug、Ru He、Viet D. Nguyen、Vu T. Nguyen、Hadi D. Arman、Kirk S. Schanze、Oleg V. Larionov
DOI:10.1021/jacs.9b12519
日期:2020.1.22
photocatalytic borylation method that can effect borylation of a wide range of substrates, including strong C‒O bonds, remains elusive. Herein, we report a general, metal-free visible light-induced photocatalytic borylation platform that enables borylation of electron rich derivatives of phenols and anilines, chloroarenes, as well as other haloarenes. The reac-tion exhibits excellent functional group
硼酸是中心重要的功能基序和合成前体。可见光诱导的硼酸化可以提供结构多样化的硼酸盐,但一种广泛有效的光催化硼酸化方法可以影响包括强 C-O 键在内的多种底物的硼化,仍然难以实现。在此,我们报告了一种通用的、无金属的可见光诱导光催化硼化平台,该平台能够对苯酚和苯胺、氯芳烃以及其他卤代芳烃的富电子衍生物进行硼化。该反应表现出优异的官能团耐受性,正如一系列结构复杂底物的硼化反应所证明的那样。值得注意的是,该反应是由吩噻嗪催化的,这是一种简单的有机光催化剂,MW< 200通过质子耦合电子转移机制介导了以前无法实现的可见光诱导的苯酚衍生物单电子还原,还原电位为~-3 V vs SCE。机理研究指出了光催化剂-碱相互作用的关键作用。
Iron-Catalysed Borylation of Arenediazonium Salts to Give Access to Arylboron Derivatives<i>via</i>Aryl(amino)boranes at Room Temperature
作者:Ludovic D. Marciasini、Nicolas Richy、Michel Vaultier、Mathieu Pucheault
DOI:10.1002/adsc.201200942
日期:2013.4.15
Complementary to previously described Miyaura borylation methods, a new access to boron derivatives via aryl(amino)boranes is described. Direct coupling between aryldiazonium salts and diisopropylaminoborane is catalysed by 0.1% ferrocene leading to the formation of a carbon‐boron bond. The obtained aryl(amino)boranes could eventually then be transformed into boronic acids, boronates or borates.
Borylation using group IV metallocene under mild conditions
作者:Ludovic D. Marciasini、Michel Vaultier、Mathieu Pucheault
DOI:10.1016/j.tetlet.2014.01.080
日期:2014.3
A borylation reaction of aromatic diazonium salts has been optimized using titanocene and zirconocenederivatives as catalysts. The reaction employs diisopropylaminoborane as a borylating agent and proceeds smoothly at room temperature to provide arylboronates after methanolysis and transesterification with pinacol. The reaction mechanism has been found to proceed via a radical pathway.
Through-space π-delocalization in a conjugated macrocycle consisting of [2.2]paracyclophane
作者:Yayu Wu、Guilin Zhuang、Shengsheng Cui、Yu Zhou、Jinyi Wang、Qiang Huang、Pingwu Du
DOI:10.1039/c9cc06492c
日期:——
Herein, we report the synthesis and characterization of a [2.2]paracyclophane-containing macrocycle (PCMC) as a new through-space conjugated macrocycle using only benzene groups as the skeleton. For comparison, a diphenylmethane-containing nanohoop macrocycle (DCMC) with a non-conjugated linker was also synthesized. Their structures were confirmed by NMR and HR-MS, and their photophysical properties
[EN] NEW PROCESS FOR PREPARING ARYLBORANES BY ARYLATION OF ORGANOBORON COMPOUNDS<br/>[FR] NOUVEAU PROCÉDÉ POUR LA PRÉPARATION D'ARYLBORANES PAR ARYLATION DE COMPOSÉS ORGANOBORÉS
申请人:UNIV BORDEAUX 1
公开号:WO2014009169A1
公开(公告)日:2014-01-16
The present invention relates to a new process for the preparation of an arylborane compound, by arylation of a B-H bond, which comprises a step (1) of contacting an arenediazonium salt or a heteroarenediazonium salt with an organoboron compound containing at least one B-H bond, in a reaction medium containing a solvent, in the absence of base, in the absence or in the presence of an activating agent, for the preparation of an arylborane compound, and a possible step (2) of recovery and purification of said arylborane compound obtained at the step (1), said arylborane being in particular an aminoarylborane, and a possible step (3) of refunctionalisation of said arylborane obtained at step (1) or (2) for the preparation of aryl boronic derivatives or arylborates.