Nucleophilic attack of intramolecular hydroxyl groups on electron-rich aromatics using hypervalent iodine(III) oxidation
作者:Kayoko Hata、Hiromi Hamamoto、Yukiko Shiozaki、Simon B. Cämmerer、Yasuyuki Kita
DOI:10.1016/j.tet.2007.02.118
日期:2007.5
The hypervalent iodine(III) reagent, phenyliodine bis(trifluoroacetate) (PIFA)-mediated oxidative nucleophilic substitution of electron-rich aromatics involving aromatic cation radical intermediates was utilized in the direct aromatic carbon–oxygen bond formation reaction, and a novel and simple synthetic method for chroman derivatives was developed. As an extension of this methodology, a facile access
2-Alkoxyarenol-derived orthoquinols in carbon–oxygen, carbon–nitrogen and carbon–carbon bond-forming reactions
作者:Stéphane Quideau、Laurent Pouységu、Mayalen Oxoby、Matthew A Looney
DOI:10.1016/s0040-4020(00)00939-x
日期:2001.1
Silylated oxygen- and nitrogen-tethered orthoquinol acetates, generated by phenyliodine(III) diacetoxy-mediated oxidative acetoxylation of 2-alkoxyphenols in CH2Cl2 can be used to furnish regioselectively benzannulated heterocycles. Oxidative activation of 2-alkoxynaphthols with non-nucleophilic phenyliodine(III) bis(trifluoroacetoxy) in the presence of carbon nucleophiles, including oxidation sensitive silyl enol ethers, constitute a potentially valuable route to naturally occurring vicinally oxygenated benz[a]anthracene motifs. (C) 2000 Elsevier Science Ltd. All rights reserved.
Aniline Derivatives from Lignin under Mild Conditions Enabled by Electrochemistry
作者:Antonio A. Castillo‐Garcia、Christian Oliver Kappe、David Cantillo、Katalin Barta
DOI:10.1002/cssc.202301374
日期:2024.2.8
Electrochemical oxidation of lignin-derived guaiacols & syringols leads to cyclohexadienone intermediates in moderate to good yields. These react with ethyl glycinate hydrochloride undermildconditions to afford lignin-based anilines. This methodology can be incorporated to reductive catalytic fractionation processes towards selective obtention of 4-propanol-2-methoxyaniline (1Gb) and 4-propyl-2-methoxyaniline