[EN] MANGANESE BASED COMPLEXES AND USES THEREOF FOR HOMOGENEOUS CATALYSIS [FR] COMPLEXES À BASE DE MANGANÈSE ET LEURS UTILISATIONS SERVANT À UNE CATALYSE HOMOGÈNE
Chemoselective Oxidation of <i>p</i>-Methoxybenzyl Ethers by an Electronically Tuned Nitroxyl Radical Catalyst
作者:Shohei Hamada、Koichi Sugimoto、Elghareeb E. Elboray、Takeo Kawabata、Takumi Furuta
DOI:10.1021/acs.orglett.0c01839
日期:2020.7.17
The oxidation of p-methoxy benzyl (PMB) ethers was achieved using nitroxylradicalcatalyst 1, which contains electron-withdrawing ester groups adjacent to the nitroxyl group. The oxidative deprotection of the PMB moieties on the hydroxy groups was observed upon treatment of 1 with 1 equiv of the co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA). The corresponding carbonyl compounds were obtained
Anodic Oxidation of (Trimethylsilyl)methanes with π-Electron Substituents in the Presence of Nucleophiles
作者:Toshio Koizumi、Toshio Fuchigami、Tsutomu Nonaka
DOI:10.1246/bcsj.62.219
日期:1989.1
It was found that oxidation potentials of methanes with π-electron substituents were decreased by introduction of a trimethylsilyl group. The anodicoxidation of benzyl-, allyl-, aryl(or alkyl)thiomethyl-, and aryloxymethyl-substituted trimethylsilanes smoothly proceeded in the presence of nucleophiles, e.g. alcohols and carboxylic acids, to eliminate the trimethylsilyl groups giving the corresponding
Erbium(III) triflate is a powerfulcatalyst for the acylation of alcohols and phenols. The reaction works well for a large variety of simple and functionalized substrates by using different kinds of acidicanhydrides Ac2O, (EtCO)2O, [(CH3)3CO]2O, Bz2O, and (CF3CO)2O} without isomerisation of chiral centres. Moreover, the catalyst can be easily recycled and reused without significant loss of activity
Synthesis and reactivity of benzylic sulfonium salts: benzylation of phenol and thiophenol under near-neutral conditions
作者:Julie Forrester、Ray V.H Jones、Lee Newton、Peter N Preston
DOI:10.1016/s0040-4020(01)00137-5
日期:2001.4
- and related hydrogensulfate salts have been synthesized from the ternary system ArCH2OH:H2SO4: Me2S or tetrahydrothiophene. The salts are generally stable crystalline solids, but anomalously high reactivity is observed for 9-(anthrylmethyl)dimethylsulfonium hydrogensulfate. Selected sulfonium salts have been used for the O- and S-benzylation of phenol and thiophenol, respectively, in a two phase
从三元体系ArCH 2 OH:H 2 SO 4:Me 2 S或四氢噻吩合成了一系列苄基二甲基ulf盐和相关的硫酸氢盐。所述盐通常是稳定的结晶固体,但是对于9-(蒽甲基)二甲基ulf硫酸氢盐观察到异常高的反应性。在接近中性的两相体系中,已选择的sulf盐分别用于苯酚和硫酚的O-和S-苄基化。还描述了在碱性条件下肟和苯并咪唑的苄基化。
β‐Aryl Nitrile Construction<i>via</i>Palladium‐Catalyzed Decarboxylative Benzylation of α‐Cyano Aliphatic Carboxylate Salts
作者:Rui Shang、Zheng Huang、Xiao Xiao、Xi Lu、Yao Fu、Lei Liu
DOI:10.1002/adsc.201200383
日期:2012.9.17
The palladium‐catalyzed decarboxylative benzylation of α‐cyano aliphatic carboxylatesalts with benzyl electrophiles was discovered. This reaction exhibits good functional group compatibility and proceeds under relatively mild conditions. A diverse range of quaternary, tertiary and secondary β‐aryl nitriles can be conveniently prepared by this method.