Electrodimerization of <i>N</i>
-Alkoxyamides for Zinc(II) Catalyzed Phenolic Ester Synthesis under Mild Reaction Conditions
作者:Kripa Subramanian、Subhash L. Yedage、Bhalchandra M. Bhanage
DOI:10.1002/adsc.201701646
日期:2018.7.4
electrochemical On‐Off method for phenolic ester synthesis from N‐alkoxyamides has been reported. This one‐pot protocol begins with rapid and selective electrodimerization of the amide using n‐Bu4NI (TBAI) as an electrocatalyst. The reaction proceeds further in the absence of current via Zn catalyzed C−N bond activation of the amide dimer followed by its coupling with phenol to form the ester. The present
已经报道了从N-烷氧基酰胺合成酚酯的电化学开-关方法。这种一锅法的协议开始于使用n- Bu 4 NI(TBAI)作为电催化剂对酰胺进行快速和选择性的电二聚。在不存在电流的情况下,该反应会进一步通过酰胺催化的二聚体的Zn催化C-N键活化而进行,然后将其与苯酚偶联形成酯。本方法学不含配体,在温和的反应条件下进行。这种转变结合了多种酚和酰胺底物,导致形成功能化的酯,从而突出了其多功能性。
Neue Methoden zur Herstellung von Carbonsäure-arylestern. Über aktivierte Ester VIII
作者:B. Iselin、W. Rittel、P. Sieber、R. Schwyzer
DOI:10.1002/hlca.19570400216
日期:——
Two new methods for preparing carboxylic acid aryl esters are presented. They consist in reacting the carboxylic acid with (a) aryl sulfites or (b) aryl phosphites in the presence of pyridine. A possible mechanism of the sulfite method is discussed.
Visible-Light-Triggered Direct Benzoyloxylation of Electron-Rich Arenes at Room Temperature without Chelation Assistance
作者:Honghua Rao、Ping Wang、Chao-Jun Li
DOI:10.1002/ejoc.201201093
日期:2012.10.18
A RuII photocatalytic method was developed for the direct mono-benzoyloxylation of electron-rich aromatic and heteroaromatic systems even with an excess amount of benzoyl peroxide. The reaction was conducted at roomtemperature under visible light. The direct ArC–H benzoyloxylations occur without the assistance of any directing groups and can also tolerate various functional groups that have already
AbstractWe report the first successful allylation of aromatic esters by allyltrimethylsilane. The reaction is mediated by 0.3–1.0 equiv. of titanium tetrachloride (TiCl4) at room temperature and leads in a multi‐step, one‐pot reaction to quaternary triallylmethane derivatives 5. The most efficient ester possessed two ortho‐methoxy substituents on the phenol ring. Molecular modelling revealed the ability of this compound to form a bidentate titanium complex, thus improving the steric accessibility of the ester carbonyl to nucleophilic attack.magnified image
Hofmann,A. W., Chemische Berichte, 1879, vol. 12, p. 1373