Manganese-Catalyzed Direct Oxidation of Methyl Ethers to Ketones
作者:Shin Kamijo、Yuuki Amaoka、Masayuki Inoue
DOI:10.1002/asia.200900420
日期:2010.3.1
into ketones was achieved using 0.1 mol % of MnCl2 and 4,4′,4′′‐tri(tert‐butyl)‐2,2′:6′,2′′‐terpyridine (tBu‐terpy) in the presence of mCPBA. Conversion of methyl ethers into ketones was particularly efficient and chemoselective. Electron‐deficient oxygen functionalities survived under the reaction conditions. The present method broadens the utility of methyl ethers as stable protective groups for hydroxy
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.