Generation of<i>β</i>-Carbonyl Radicals from Cyclopropanol Derivatives by the Oxidation with Manganese(III) 2-Pyridinecarboxylate and Their Reactions with Electron-Rich and -Deficient Olefins
Various β-carbonyl radicals are generated oxidatively from cyclopropanol derivatives by the use of manganese(III) 2-pyridinecarboxylate (Mn(pic)3). These β-carbonyl radicals react with electron-rich olefins such as conjugated silyl enol ethers, a ketene thioacetal, a ketene dithioacetal, and a vinyl ether intermolecularly to give crossed-addition products in good yield. Furthermore, the combined use
Generation of β-Keto Radicals from Cyclopropanols Catalyzed by AgNO<sub>3</sub>
作者:Shunsuke Chiba、Zhengyan Cao、Serry Atta Atta El Bialy、Koichi Narasaka
DOI:10.1246/cl.2006.18
日期:2006.1
Various β-keto radicals are generated from cyclopropanols by treatment with a catalytic amount of AgNO3 and (NH4)2S2O8 as a reoxidant in the presence of pyridine. Thus, generated β-keto radicals react with alkenes to yield addition products.