Room temperature Ni-catalyzed reduction of aryl tosylates by borane hydrides
摘要:
Mild Ni-catalyzed homogeneous reductions of aryl tosylates are described for the first time. The catalytic system Ni(PPh3)(2)Cl-2 and PCy3 is shown to be general for hydrogenolysis of a wide range of tosylates, including hindered, deactivated, heterocyclic, and bifunctional examples. (c) 2006 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Carbonylation of Aryl Tosylates and Mesylates
作者:Rachel H. Munday、Joseph R. Martinelli、Stephen L. Buchwald
DOI:10.1021/ja711449e
日期:2008.3.1
A general protocol for the palladium-catalyzed carbonylation of aryl tosylates and mesylates to form esters has been developed using a catalyst system derived from Pd(OAc)2 and the bulky, bidentate dcpp ligand. The system operates under mild conditions: atmospheric CO pressure and temperatures of 80-110 degrees C. A broad substrate scope has been demonstrated allowing carbonylation of electron-rich
已经使用衍生自 Pd(OAc)2 和庞大的双齿 dcpp 配体的催化剂系统开发了钯催化的甲苯磺酸芳基酯和甲磺酸酯羰基化形成酯的通用方案。该系统在温和的条件下运行:大气 CO 压力和 80-110 摄氏度的温度。 广泛的底物范围已被证明允许富电子、缺电子和杂环甲苯磺酸酯和甲磺酸酯羰基化,反应显示出广泛的官能团宽容。
A nickel precatalyst for efficient cross-coupling reactions of aryl tosylates with arylboronic acids: vital role of dppf
作者:Feng Hu、Xiangyang Lei
DOI:10.1016/j.tet.2014.04.059
日期:2014.6
An air-stable and easy-to-handle nickelprecatalyst, (9-phenanthrenyl)Ni(II)(PPh3)2Cl, was examined for the cross-couplingreactions of aryl tosylates with arylboronic acids. Under the optimized reaction conditions, the catalytic system tolerates a wide range of activated, neutral and deactivated substrates. The selectivity of this cross-couplingreaction towards aryl tosylates and arylboronic acids
The present invention provides an activator in arylamination using a palladium compound as a catalyst, which is superior to conventional phosphines in stability and performance. With the phosphine sulfide as an activator, an arylamination reaction achieves improved selectivity to produce a desired aromatic amine in an obviously increased yield as compared with a reaction using the corresponding phosphine compound. Moreover, the phosphine sulfide of the invention is impervious to oxidation and exists stably in air and therefore sufficiently withstands use on an industrial scale.
Cross-Coupling of Phenol Derivatives with Umpolung Aldehydes Catalyzed by Nickel
作者:Leiyang Lv、Dianhu Zhu、Jianting Tang、Zihang Qiu、Chen-Chen Li、Jian Gao、Chao-Jun Li
DOI:10.1021/acscatal.8b01224
日期:2018.5.4
cross-coupling to construct the C(sp2)–C(sp3) bond was developed from two sustainable biomass-based feedstocks: phenolderivatives with umpolung aldehydes. This strategy features the in situ generation of moisture/air-stable hydrazones from naturally abundant aldehydes, which act as alkyl nucleophiles under catalysis to couple with readily available phenolderivatives. The avoidance of using both halides
Iron(<scp>ii</scp>) triflate/N-heterocyclic carbene-catalysed cross-coupling of arylmagnesiums with aryl chlorides and tosylates
作者:Yi-Yuan Chua、Hung A. Duong
DOI:10.1039/c5cc08302h
日期:——
In comparison to iron(II) halides, iron(II) triflate exhibits a greater resistance towards reduction by p-tolylmagnesium bromide. This knowledge led to the development of an iron(II) triflate/N-heterocyclic carbene-catalysed cross-coupling of aryl...