Organocatalytic peroxidation of malonates, β-ketoesters, and cyanoacetic esters using n-Bu4NI/t-BuOOH-mediated intermolecular oxidative C(sp3)–O coupling
作者:Alexander O. Terent'ev、Alexander T. Zdvizhkov、Dmitri O. Levitsky、Fabrice Fleury、Roman A. Pototskiy、Alena N. Kulakova、Gennady I. Nikishin
DOI:10.1016/j.tet.2015.09.047
日期:2015.11
A new organocatalytic approach for the synthesis of peroxides based on CH activation of a sp(3)-hybridized carbon atom is reported. Peroxides were prepared in 31-89% yield by the reaction of malonates, beta-ketoesters, and cyanoacetic esters with a Bu4NI/tert-butyl hydroperoxide system. The formation of the expected hydroxylation products was not observed. In the discovered reaction, tert-butyl hydroperoxide plays a dual role by acting as the oxidant and the O-reagent for the C-O coupling. The synthesis can be scaled up to generate gram quantities of the target products. (C) 2015 Elsevier Ltd. All rights reserved.
Selective Synthesis of Unsymmetrical Peroxides: Transition-Metal-Catalyzed Oxidation of Malononitrile and Cyanoacetic Ester Derivatives by tert-Butyl Hydroperoxide at the α-Position
malononitrile and cyanoaceticester derivatives at the α-position based on transition-metal-catalyzed reaction (Cu, Fe, Mn, Co) with tert-butyl hydroperoxide giving unsymmetrical peroxides in 63-94% yields. The method is facile, does not require large excesses of reagents, and is amenable to gram-scale synthesis. peroxides - tert-butyl hydroperoxide - catalysis - oxidation - transition metals - malononitrile