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.
radicals, generated in situ. A simple metal-free borylation of aryl iodides mediated by a fluoride sp2–sp3 diboron adduct is described. The reaction conditions are compatible with various functional groups. Electroniceffects of substituents do not affect the borylation while steric hindrance does. The reaction proceeds via a radical mechanism in which pyridine serves to stabilize the boryl radicals, generated
Nickel-catalysed decarbonylative borylation of aroyl fluorides
作者:Zhenhua Wang、Xiu Wang、Yasushi Nishihara
DOI:10.1039/c8cc08504h
日期:——
The first Ni(cod)2/PPh3 catalyst system has been established for decarbonylative borylation of aroylfluorides with bis(pinacolato)diboron. A wide range of functional groups in the substrates were well tolerated. The ease of access of the starting aroylfluorides indicates that these results might become an alternative to the existing decarbonylation events.
trifluoromethylation via AgI/AgIII redox shuttles are herein deciphered. This innovative cross-coupling, analogous to the CEL coupling popularized by copper, involves: i) easy AgI/AgIII 2e− oxidation; ii) phen ligation to AgIII; iii) boron-to-AgIII aryl transfer; and iv) benzotrifluoride production from aryl-AgIII intermediates. Now, AgIIICF3 chemistry is safe and reachable from AgF, KF, CF3TMS and air.
教银做伎俩。通过Ag I / Ag III氧化还原穿梭进行氧化三氟甲基化的最关键步骤在本文中被破译。这种创新的交叉耦合类似于铜普及的 CEL 耦合,包括:i)容易的 Ag I /Ag III 2 e -氧化;ii)苯连接到 Ag III 上;iii)硼到 Ag III芳基转移;和ⅳ)三氟甲苯产量从芳基的Ag III中间体。现在,Ag III CF 3化学是安全的,可以从 AgF、KF、CF 3 TMS 和空气中获得。
Steric and Chelate Directing Effects in Aromatic Borylation
作者:Jian-Yang Cho、Carl N. Iverson、Milton R. Smith
DOI:10.1021/ja0013069
日期:2000.12.1
Jian-Yang Cho, Carl N. Iverson, and Milton R. Smith, III*Department of Chemistry, Michigan State UniVersityEast Lansing, Michigan 48824ReceiVed April 14, 2000ReVised Manuscript ReceiVed October 18, 2000Hydrocarbon activation has attracted considerable attentionbecause hydrocarbon feedstocks are ubiquitous.
Jan-Yang Cho, Carl N. Iverson, and Milton R. Smith, III*Department of Chemistry, Michigan State University East Lansing, Michigan 48824ReceiVed April 14, 2000Receive Manuscript Received 2000 年 10 月 18 日 碳氢化合物活化已引起相当多的关注,因为碳氢化合物的原料无处不在。