Syntheses of (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)arenes through Pd-catalyzed borylation of arylbromides with the successive use of 2,2′-bis(1,3,2-benzodioxaborole) and pinacol
摘要:
Syntheses of (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)arenes through the Pd-catalyzed borylation of arylbromides with the successive use of 2,2'-bis(1,3,2-benzodioxaborole) and pinacol were investigated. PdCl2(dppf) and AcOK in EtOH or DMSO successfully provided (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)arenes. In particular, this method was more effective in the borylation of arylbromides bearing sulfonyl groups than the conventional Pd-catalyzed borylation using pinacolborane or bis(pinacolato)diboron. (C) 2012 Elsevier Ltd. All rights reserved.
An Opportunity for Mg-Catalyzed Grignard-Type Reactions: Direct Coupling of Benzylic Halides with Pinacolborane with 10 mol % of Magnesium
作者:Christine Pintaric、Sandra Olivero、Yves Gimbert、Pierre Y. Chavant、Elisabet Duñach
DOI:10.1021/ja1052973
日期:2010.9.1
Mg in catalytic amounts as the only metal permits the reductive coupling between benzyl halides and pinacolborane. HBpin acts both as an electrophile and as a reducing agent to regenerate an organomagnesium species in situ. An hydride oxidation mechanism is proposed on the basis of DFT calculations.
PROCESS FOR PREPARING BORONIC ACIDS AND ESTERS IN THE PRESENCE OF MAGNESIUM METAL
申请人:Dunach Isabel
公开号:US20110282090A1
公开(公告)日:2011-11-17
The present invention relates to the process for preparing a boronic acid or ester chemically, in which an aromatic compound is reacted with a boronating agent, in the presence of magnesium metal (Mg
0
). The invention also relates to the boronic acids or esters that can be obtained by means of this process and to the use thereof for example as a synthesis intermediate, in the Suzuki reaction, in the pharmaceutical or alternatively electronics field.
[EN] NEW THIENOPYRIMIDINE DERIVATIVES, A PROCESS FOR THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM<br/>[FR] NOUVEAUX DÉRIVÉS DE THIÉNOPYRIMIDINE, PROCÉDÉ POUR LEUR PRÉPARATION ET COMPOSITIONS PHARMACEUTIQUES LES CONTENANT
申请人:SERVIER LAB
公开号:WO2015097123A1
公开(公告)日:2015-07-02
Compounds of formula (I): wherein R1, R2, R3, R4, R5, R6, R7, R12, X, A and n are as defined in the description.
Synthesis of Pinacol Arylboronates from Aromatic Amines: A Metal-Free Transformation
作者:Di Qiu、Liang Jin、Zhitong Zheng、He Meng、Fanyang Mo、Xi Wang、Yan Zhang、Jianbo Wang
DOI:10.1021/jo3018878
日期:2013.3.1
A metal-free borylation process based on Sandmeyer-type transformation using arylamines derivatives as the substrates has been developed. Through optimization of the reaction conditions, this novel conversion can be successfully applied to a wide range of aromatic amines, affording borylation products in moderate to good yields. Various functionalized arylboronates, which are difficult to access by
C−H Borylation of arenes has been a subject of great interest recently because of its atom‐economy and the wide applicability of borylated products in value‐added synthesis. A new bis(silylene)cobalt(II) complex bearing a bis(N‐heterocyclic silylene)‐pyridine pincer ligand (SiNSi) has been synthesized and structurally characterized. It enabled the regioselective catalytic C−H borylation of pyridines