Alkylboronic Esters from Copper-Catalyzed Borylation of Primary and Secondary Alkyl Halides and Pseudohalides
作者:Chu-Ting Yang、Zhen-Qi Zhang、Hazmi Tajuddin、Chen-Cheng Wu、Jun Liang、Jing-Hui Liu、Yao Fu、Maria Czyzewska、Patrick G. Steel、Todd B. Marder、Lei Liu
DOI:10.1002/anie.201106299
日期:2012.1.9
unprecedented copper‐catalyzed cross‐coupling reaction of the title compounds with diboron reagents is described (see scheme; Ts=4‐toluenesulfonyl). This reaction can be used to prepare both primary and secondaryalkylboronic esters having diverse structures and functional groups. The resulting products would be difficult to access by other means.
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
cobalt-complex-catalyzed borylation of a wide range of alkyl halides with a diboron reagent (B2pin2 or B2neop2) has been developed under mild reaction conditions, demonstrating the first cobalt-mediated cross-coupling with alkyl electrophiles. This protocol allows alkyl boronic esters to be accessed from alkyl halides, including alkylchlorides, which were used rarely as coupling partners. Mechanistic
Facile synthesis of alkyl- and arylboronate esters enabled by a carbon nanotube supported copper catalyst
作者:Suresh Saini、Deepak S. Gavali、Ramesh Bhawar、Ranjit Thapa、Rajendra S. Dhayal、Shubhankar Kumar Bose
DOI:10.1039/d2cy01741e
日期:——
that the reaction involves a radical pathway. The catalyst can be recycled up to ten runs without appreciable loss in the activity. In addition, we demonstrated the use of this supported copper catalyst for the anti-Markovnikov-selective hydroboration of vinylarenes and borylation of aryl halides with B2pin2, providing alkyl- and arylboronateesters, respectively, in good to excellent yields.
报道了通过稳定在氮掺杂碳纳米管 (N-CNT) 上的铜纳米粒子催化的卤代烷硼酸化有效合成烷基硼酸酯。这种纳米催化剂提供了在室温下 1 小时内获得烷基硼酸酯的实用方法,具有良好的官能团耐受性。该程序也适用于苄基氯化物和溴化物的硼化反应。自由基时钟实验表明该反应涉及自由基途径。催化剂最多可循环十次,而活性不会有明显损失。此外,我们展示了这种负载型铜催化剂在乙烯基芳烃的反马尔可夫尼科夫选择性硼氢化反应和芳基卤化物与 B 2引脚2的硼化反应中的用途,分别以良好至极好的收率提供烷基硼酸酯和芳基硼酸酯。
Rh(I)-catalyzed borylation of primary alkyl chlorides
作者:Tian-Jun Gong、Yuan-Ye Jiang、Yao Fu
DOI:10.1016/j.cclet.2014.01.006
日期:2014.3
Rhodium-catalyzed cross-coupling reactions of unactivated primary alkyl chlorides with diboron reagents have been developed as practical methods for the synthesis of alkylboronic esters. These reactions expand the concept and utility of Rh(I)-catalyzed cross-coupling of aliphatic electrophiles. (C) 2014 Yao Fu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.