SELECTIVE AND EFFICIENT OXIDATIVE DEPROTECTION OF TRIMETHYLSILYL AND TETRAHYDROPYRANYL ETHERS, ETHYLENE ACETALS AND KETALS WITH<i>n</i>-BUTYLTRIPHENYLPHOSPHONIUM PEROXODISULFATE (Bu<sup><i>n</i></sup>PPh<sub>3</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>
作者:I. Mohammadpoor-Baltork、A. R. Hajipour、M. Aghajari
DOI:10.1081/scc-120003626
日期:2002.1
n-Butyltriphenylphosphonium peroxodisulfate in refluxing acetonitrile transforms trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers, ethylene acetals and ketals to their corresponding carbonyl compounds in excellent yields. Selectiveoxidativedeprotection of TMS and THP ethers in the presence of ethylene acetals (ketals) is of additional importance in this method.
Electrochemical reduction of the trimethylsilyl enolates of alkyl aryl ketones induces retro-Brook rearrangement to provide 1-aryl-1-trimethylsilylalkan-1-ols. The transformation proceeds through a sequence of 1) single-electron reduction of the silyl enolate, 2) protonation with a phenol, 3) another single-electron reduction to form a siloxy-substituted benzylic anion, and 4) the pivotal retro-Brook