CCl<sub>3</sub>CN: A Crucial Promoter of <i>m</i>CPBA-Mediated Direct Ether Oxidation
作者:Shin Kamijo、Shoko Matsumura、Masayuki Inoue
DOI:10.1021/ol1018079
日期:2010.9.17
The direct oxidation of ether sp(3) C-H bonds using the new reagent system mCPBA/CCl3CN/MeCN has been developed. CCl3CN in MeCN drastically alters the reactivity of m-chloroperbenzoic acid (mCPBA), and chemoselective transformation of methyl ethers to ketones was realized under mild conditions. Radical-based mCPBA-mediated oxidation was suggested as the reaction mechanism. The present new reaction expands the utility of methyl ethers as stable synthetic precursors of carbonyl compounds and of mCPBA as a radical-based C-H oxidizing agent.
A Nonenzymatic Acid/Peracid Catalytic Cycle for the Baeyer−Villiger Oxidation
作者:Gorka Peris、Scott J. Miller
DOI:10.1021/ol8010248
日期:2008.7.17
The combined action of carbodiimide and hydrogen peroxide upon exposure to carboxylic acid catalysts serves to generate transient peracids that can be engaged in the Baeyer-Villiger rearrangement of ketones to lactones. Up to 35 turnovers of the catalytic cycle may be achieved. The conditions are especially useful in the context of reactive cyclohexanones, and allow the use of H2O2 as the terminal