Room-temperature base-free copper-catalyzed trifluoromethylation of organotrifluoroborates to trifluoromethylarenes
摘要:
An efficient room temperature copper-catalyzed trifluoromethylation of organotrifluoroborates under the base free condition using an electrophilic trifluoromethylating reagent is demonstrated. The corresponding trifluoromethylarenes were obtained in good to excellent yields and the reaction tolerates a wide range of functional groups. (C) 2012 Elsevier Ltd. All rights reserved.
Metal-Free and Redox-Neutral Conversion of Organotrifluoroborates into Radicals Enabled by Visible Light
作者:Wenbo Liu、Peng Liu、Leiyang Lv、Chao-Jun Li
DOI:10.1002/anie.201807181
日期:2018.10.8
through an SH2 process. This strategy is enabled by using water as the solvent, visible light as the energy input, and diacetyl as the promoter in the absence of any metal catalyst or redox reagent, thereby eliminating metal waste. To demonstrate its synthetic utility, an efficient acetylation to prepare valuable aryl (alkyl) methyl ketones is described and applications to construct C−C, C−I, C−Br
将有机硼化合物转化为相应的基团在有机化学中具有广泛的合成应用。为了实现这些转化,需要采用化学计量的各种强氧化剂如Mn(OAc)3,AgNO 3 / K 2 S 2 O 8和Cu(OAc)2,并通过单电子转移机理进行。本文确立了一种独特的策略,可通过S H从有机三氟硼酸盐生成芳基和烷基2过程。在没有任何金属催化剂或氧化还原试剂的情况下,通过使用水作为溶剂,使用可见光作为能量输入,使用二乙酰作为促进剂来启用此策略,从而消除了金属浪费。为了证明其合成用途,描述了一种有效的乙酰化反应以制备有价值的芳基(烷基)甲基酮,并且构造C-C,C-I,C-Br和C-S键的应用也是可行的。实验证据表明,三联体二乙酰是该过程的关键中间体。
Electrochemical
<i>ipso</i>
‐Thiocyanation of Arylboron Compounds
作者:Marco Dyga、Davit Hayrapetyan、Raja K. Rit、Lukas J. Gooßen
DOI:10.1002/adsc.201900156
日期:2019.8.5
An operationally simple electrochemicalmethod for the transition‐metal‐free ipso‐thiocyanation of arylboronicacids and aryl trifluoroborates has been developed. The SCN electrophile is generated in situ by anodic oxidation of thiocyanate anions, which avoids formation of salt waste and prevents unwanted side reactions arising from chemical oxidants. The reaction proceeds regiospecifically, and the
Temperature-controlled sequential Suzuki–Miyaura reactions for preparing unsymmetrical terphenyls
作者:Xinmin Li、Chun Liu、Lei Wang、Qing Ye、Xin Jin、Zilin Jin
DOI:10.1039/c8ob01661e
日期:——
A one-pot protocol of double Suzuki–Miyaura reactions has been developed for the synthesis of unsymmetrical terphenyls. In the absence of a ligand, potassium bromophenyltrifluoroborate reacts with arylboronic acid and then sequentially with a hetero/aryl bromide by controlling the reaction temperature, providing unsymmetrical p- and m-terphenyl compounds in moderate to good overall yields. This protocol
procedure for the copper-mediated oxidativetrifluoromethylthiolation of potassium aryl- and heteroaryltrifluoroborates with Ruppert–Prakash reagent and elementalsulfur is presented. Aryl trifluoromethyl thioethers can be prepared in good to moderate yield under mild reaction conditions. A facile procedure for the copper-mediated oxidativetrifluoromethylthiolation of potassium aryl- and heteroaryltrifluoroborates
The direct palladium-catalyzed coupling of polyfluoroarenes with aryltrifluoroborates gave the desired products of fluorinated biaryls in good to excellent yields. A diverse set of important functional groups including methoxy, aldehyde, ester, nitro and halide can be well tolerated in the protocol. (c) 2013 Elsevier B.V. All rights reserved.