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.
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
barrier and reaction free energy, were calculated using density functional theory (DFT), and influencing factors of the reaction were discussed. Theoretical computations showed that this nucleophilicsubstitution is favorable both kinetically and thermodynamically, while electron-withdrawing groups on phenols are harmful to such reactions. This study will provide new knowledge and insights on the chemical
An iodine-induced synthesis of sulfonate esters via cross-coupling reactions of sodiumsulfinates with phenols is reported. This synthetic route is low-cost, facile, green and efficient, and could afford the target products with good to excellent yields under mild conditions.
N-Heterocyclic Carbene–Palladium(II)–1-Methylimidazole Complex-Catalyzed Suzuki–Miyaura Coupling of Aryl Sulfonates with Arylboronic Acids
作者:Zhan-Yong Wang、Gao-Qi Chen、Li-Xiong Shao
DOI:10.1021/jo301270t
日期:2012.8.3
the Suzuki–Miyauracoupling of arylsulfonates including tosylates and phenylsulfonates with arylboronicacids, giving the desired coupling products in good to high yields. Acceptable yields can also be achieved even by using the less reactive mesylates as the substrates. It is worthy of noting here that this is the first example of NHC–Pd(II) complex-catalyzed Suzuki–Miyauracoupling of aryl sulfonates
Copper-Catalyzed Regioselective C-H Sulfonyloxylation of Electron-Rich Arenes with <i>p</i>-Toluenesulfonic Acid and Sulfonyloxylation of Aryl(mesityl)iodonium Sulfonates
Copper-catalyzed regioselective C-H sulfonyloxylation of electron-rich arenes with p-toluenesulfonic acid has been developed. Electron-rich benzene derivatives and heteroarenes can undergo this C-H sulfonyloxylation reaction to generate aryl tosylates. Furthermore, sulfonyloxylation of aryl(mesityl)iodonium sulfonates has also been investigated. Both aryl(mesityl)iodonium tosylates and triflates can