Electrochemical carboxylation of cinnamate esters in MeCN
作者:Huan Wang、Kai Zhang、Ying-Zi Liu、Mei-Yu Lin、Jia-Xing Lu
DOI:10.1016/j.tet.2007.10.104
日期:2008.1
of cinnamate esters has been carried out by cathodic reduction of CC bond in an undivided cell equipped with Mg sacrificial anode and using MeCN saturated with CO2 as solvent. The yields and the ratio of mono- and dicarboxylicacids are strongly affected by various factors: cathodic material, current, charge, and temperature. The highest yield (78.9%) was obtained starting from ethyl cinnamate. Cyclic
A carbene insertion into electron‐deficient C−H bonds of 1,3‐diesters, β‐ketoesters, β‐ketonitriles, and malononitriles was realized by using CuCN/PCy3 as the catalyst. The reaction provides a straightforward approach to the synthetically important multi‐substituted succinic acid derivatives. A plausible reaction mechanism with cyclopropanation/ring opening as key steps was proposed based on control
A C<sub>sp<sup>3</sup></sub>–C<sub>sp<sup>3</sup></sub> Bond Forming Reductive Condensation of α-Keto Esters and Enolizable Carbon Pronucleophiles
作者:Wei Zhao、Darla M. Fink、Carolyn A. Labutta、Alexander T. Radosevich
DOI:10.1021/ol401276b
日期:2013.6.21
functionalized unsymmetrical 1,4-dicarbonyl structural motifs by a phosphorus(III)-mediated reductive condensation of α-ketoesters and enolizable carbon pronucleophiles is described. The reaction, which is initiated by Kukhtin–Ramirez addition of commercially available tris(dimethylamino)phosphine to the α-ketoester substrate, proceeds rapidly under mild conditions.