Selective Synthesis of Alkylboronates by Copper(I)-Catalyzed Borylation of Allyl or Vinyl Arenes
作者:Yanmei Wen、Jianying Xie、Chunmei Deng、Chaode Li
DOI:10.1021/jo502606x
日期:2015.4.17
An efficientcopper-catalyzedborylation reaction of allyl or vinyl arenes with bis(pinacolato)diboron has been developed, without using ligands. Markovnikov-selectivity is observed in the borylation of allyl arenes with bis(pinacolato)diboron, while the regioselectivity is completely opposite when styrene derivatives are used as substrates. A mechanism involving Cu–B species regioselectively adding
Cobalt-catalysed Markovnikov selective hydroboration of vinylarenes
作者:Jingying Peng、Jamie H. Docherty、Andrew P. Dominey、Stephen P. Thomas
DOI:10.1039/c7cc01085k
日期:——
A bipyridiyl–oxazoline cobalt catalyst tBuBPOCoCl2 has been developed for the Markovnikov selective hydroboration of alkenes using pinacolborane and NaOtBu as the in situ activator with up to >98:2 branched:linear selectivity (24 examples, 45–92% isolated yield).
已经开发了一种联吡啶-恶唑啉钴催化剂t Bu BPOCoCl 2,用于使用频哪醇硼烷和NaO t Bu作为原位活化剂对烯烃进行马尔可夫尼科夫选择性加氢硼化,支链:线性选择性最高> 98 :2 (24例,45-92%分离的产量)。
Markovnikov-Selective Hydroboration of Vinylarenes Catalyzed by a Cobalt(II) Coordination Polymer
Highly efficient and practical hydroboration of alkenes has been catalyzed by an inexpensive and air-stable cobalt(II) coordination polymer (CP) in the presence of KOtBu. Complete conversion of alkenes to alkylboronates were performed within just 5 min with low catalyst loading (0.025 mol %), achieving the record high turnover frequencies of up to 47 520 h–1. For a range of vinylarenes, unusual Markovnikov
在KO t Bu存在下,廉价且空气稳定的钴(II)配位聚合物(CP)催化了烯烃的高效,实用的硼氢化反应。在短短5分钟内以低催化剂负载量(0.025 mol%)将烯烃完全转化为烷基硼酸酯,实现了高达47 520 h –1的创纪录高周转率。对于一定范围的乙烯基芳烃,观察到了异常的马尔可夫尼科夫选择性。
Highly selective Markovnikov hydroboration of alkyl-substituted terminal alkenes with a phosphine–copper(<scp>i</scp>) catalyst
作者:Hiroaki Iwamoto、Koji Kubota、Hajime Ito
DOI:10.1039/c6cc00782a
日期:——
A new method has been developed for the Markovnikov hydroboration of alkyl-substituted terminal alkenes. Notably, the use of a bulky bisphosphine-copper(I) catalyst system resulted in high regioselectivity to afford secondary...