Pd-Catalyzed Sequential C–C Bond Formation and Cleavage: Evidence for an Unexpected Generation of Arylpalladium(II) Species
摘要:
A Pd(II)-catalyzed reaction engaging alkenyl beta-keto esters is reported that leads to the formation of 1-naphthols and an unexpected generation of arylpalladium-(II) species. Interception of the in situ generated arylpalladium(II) species in a Mizoroki-Heck reaction, together with additional mechanistic studies, provided strong evidence in support of the first aromatization-driven beta-carbon elimination process. A single Pd catalyst served to promote a series of both C-C bond forming and cleavage events in an unprecedented manner.
Abstract Hydroxynaphthyl ketones were obtained with high yields under very mild conditions in the presence of AlCl3 via Friedel–Crafts acylation and demethylation from naphthyl ethers. Several Lewis acids were tested, and AlCl3 was the most efficient catalyst.
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
Catalytic direct C-acylation of phenol and naphthol derivatives using carboxylic acids as acylating reagents
作者:Shū Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1016/0040-4039(96)00790-3
日期:1996.6
Direct regioselective C-acylation of phenol and naphtholderivatives was carried out by using carboxylic acids as acylating reagents. The reactions proceeded smoothly in the presence of a catalytic amount of Hf(OTf)4 to afford the corresponding aromatic ketones in good yields.
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...