Development of a Rhodium(II)-Catalyzed Chemoselective C(sp<sup>3</sup>)H Oxygenation
作者:Yun Lin、Lei Zhu、Yu Lan、Yu Rao
DOI:10.1002/chem.201502140
日期:2015.10.12
We report the first example of RhII‐catalyzed chemoselective double C(sp3)Hoxygenation, which can directly transform various toluene derivatives into highly valuable aromatic aldehydes with great chemoselectivity and practicality. The critical combination of catalyst Rh(OAc)2, oxidant Selectfluor, and solvents of TFA/TFAA promises the successful delivery of the oxidation with satisfactory yields
Palladium-catalyzed ortho-selective CH bond chlorination of aromatic ketones
作者:Gang Shan、Gui-Yi Huang、Yu Rao、Hui Zhang
DOI:10.1016/j.cclet.2015.07.011
日期:2015.10
A palladium-catalyzed ortho-selective C-H bond chlorination reaction for the preparation of 2-chloro aromatic ketones was described. Both electron-withdrawing and electron-donating groups on the aromatic rings are well tolerated under the optimized conditions. The 2-chloro aromatic ketones obtained by our method could be applied to synthesize the derivatives of 1H-indazole or benzo[d]isoxazole. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Catalyst-free alkanoylation of aromatic rings via arylstannanes. Scope and limitations
作者:Marcos J. Lo Fiego、María T. Lockhart、Alicia B. Chopa
DOI:10.1016/j.jorganchem.2009.07.019
日期:2009.10
The reaction of alkanoyl chlorides with arylstannanes in 1,2-dichlorobenzene (180 degrees C) is a simple and direct route for the catalyst-free and regioselective synthesis of tertiary alkyl aryl ketones in good to excellent isolated yields (55-77%). Nevertheless, under similar conditions, reactions carried out with alkanoyl chlorides bearing alpha-hydrogens render only the product of protodestannylation. (C) 2009 Elsevier B. V. All rights reserved.