Synthesis of 2-Acylphenol and Flavene Derivatives from the Ruthenium-Catalyzed Oxidative C-H Acylation of Phenols with Aldehydes
作者:Hanbin Lee、Chae S. Yi
DOI:10.1002/ejoc.201403518
日期:2015.3
[(C6H6)(PCy3)(CO)RuH]+BF4- has been found to be an effective catalyst for the oxidativeC-H coupling reaction of phenols with aldehydes to give 2-acylphenol compounds. The coupling of phenols with α,β-unsaturated aldehydes selectively gives the flavenederivatives. The catalytic method mediates direct oxidativeC-H coupling of phenol and aldehyde substrates without using any metal oxidants or forming wasteful byproducts
Hafnium trifluoromethanesulfonate (Hf(OTf)4) as an efficient catalyst in the fries rearrangement and direct acylation of phenol and naphthol derivatives
作者:Shu Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1016/0040-4039(96)00216-x
日期:1996.3
Hafnium trifluoromethanesulfonate (hafniumtriflate, Hf(OTf)4) was found to be an efficientcatalyst in the Fries rearrangement of acyloxy benzene or naphthalene derivatives. The reactions proceeded smoothly in the presence of 5–20 mol% Hf(OTf)4. Regioselective direct acylation of phenol and naphthol derivatives with acid chlorides was also achieved by using Hf(OTf)4 as a catalyst.
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...
Metal triflates–methanesulfonic acid as new catalytic systems: application to the Fries rearrangement
作者:Omar Mouhtady、Hafida Gaspard-Iloughmane、Nicolas Roques、Christophe Le Roux
DOI:10.1016/s0040-4039(03)01599-5
日期:2003.8
triflates (Mg, Ca, Sc, Cu, Zn, Y, Ln, Bi) and methanesulfonic acid, leading to active catalytic systems for the Fries rearrangement. In particular, the systems based on yttrium and copper(II) triflate proved to be very active and much cheaper than scandium triflate. The efficiency of these systems might result from the catalytic Lewis acid activation of Brønsted acids.
The catalytic Fries rearrangement of acyloxy naphthalenes using scandium trifluoromethanesulfonate as a catalyst
作者:Sh? Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1039/c39950001527
日期:——
The catalytic Fries rearrangement of acyloxy naphthalenes proceeds smoothly using a small amount of scandium trifluoromethanesulfonate (5 mol%) to afford the corresponding hydroxynaphthyl ketones in high yields.