Bismuth triflate was found to be an efficient catalyst in the Fries rearrangement of phenyl or 1-naphthyl acetates. Both reactions proceeded smoothly with a catalytic amount of bismuth triflate (10 mol%) to afford the corresponding hydroxyaryl ketone in moderate to good yields in most cases.
Acetoxylation of arenes is an important reaction and an unmet need in chemistry. We report a metal-free, direct acetoxylation reaction using sodium nitrate under an anhydrous environment of trifluoroacetic acid, acetic acid, and acetic anhydride. Arenes (31 examples), with oxidation potentials (Eox, in V vs SCE) lower than benzene (2.48 V), were acetoxylated with good yields and regioselectivity. A
芳烃的乙酰氧基化是一个重要的反应,也是化学中未满足的需求。我们报告了在三氟乙酸、乙酸和乙酸酐的无水环境下使用硝酸钠进行的无金属直接乙酰氧基化反应。芳烃(31 个实例)的氧化电位(E ox,单位为 V vs SCE)低于苯(2.48 V),以良好的产率和区域选择性被乙酰氧基化。提出了一种逐步的单电子转移机制。
The Catalytic Fries Rearrangement and<i>o</i>-Acylation Reactions Using Group 3 and 4 Metal Triflates as Catalysts
作者:Shu Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1246/bcsj.70.267
日期:1997.1
Group 3 and 4 metal triflates (Sc(OTf)3, TiCl(OTf)3, Zr(OTf)4, and Hf(OTf)4) were found to be efficient catalysts in the Fries rearrangement of phenyl or 1-naphthyl acylates. It was also found that...
LIGAND, NICKEL COMPLEX COMPRISING THE LIGAND, AND REACTION USING THE NICKEL COMPLEX
申请人:NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY
公开号:US20160074853A1
公开(公告)日:2016-03-17
An object of the present invention is to provide a method for directly performing arylation (particularly α-arylation) of carbonyl or thiocarbonyl compounds using a more inexpensive phenol derivative and nickel catalyst. Another object of the present invention is to provide a novel nickel catalyst that can be used in this method, and a novel ligand of the nickel catalyst. The novel compounds of the present invention are a compound having a diphosphine skeleton in which a five- or six-membered heterocyclic ring is substituted with two dialkylphosphines and/or dicycloalkylphosphines, or a salt thereof, and a compound having the diphosphine skeleton that is bound to nickel. Moreover, coupling reaction of a carbonyl compound and a phenol derivative can be advanced in the presence of a nickel compound having a monodentate or bidentate dialkylphosphine and/or dicycloalkylphosphine skeleton.