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
Compounds of the formula
wherein R is primary or secondary C₁-C₈ alkyl, C₂-C₄ alkenyl-CH₂, C₃-C₈ cycloalkyl or C₃-C₆ cycloalkyl-substituted C₁-C₅ primary or secondary alkyl, the total number of carbon atoms in R not to exceed 8; R¹ is allyl, H, or C₁-C₄ straight chain alkyl, and R² is C₁-C₃ alkoxy-C₅-C₇ cycloalkyl; a primary or secondary C₁-C₃ alkoxy-C₂-C₆-alkyl or di(C₁-C₃ alkoxy)-C₂-C₆alkyl; C₃-C₇ ketoalkyl; or C₅-C₇ cycloalkyl or keto-substituted C₅-C₇ cycloalkyl; or 4-hydroxycyclohexyl; or a pharmaceutically-acceptable salt thereof, are useful as 5HT₂ receptor antagonists.