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
307. Correlation between reactivity of the 1-carbon atom in alcohols, and certain properties of alkoxysilanes
作者:W. Gerrard、K. D. Kilburn
DOI:10.1039/jr9560001536
日期:——
Reetz,M.T. et al., Chemische Berichte, 1978, vol. 111, p. 1083 - 1094
作者:Reetz,M.T. et al.
DOI:——
日期:——
Selective, Convenient and Efficient Deprotection of Trimethylsilyl and Tetrahydropyranyl Ethers, Ethylene Acetals and Ketals with Oxone under Non-aqueous Conditions
An efficient and selective method for the deprotection of trimethylsilyl (TMS) and tetrahydropyranyl (THP) ethers, ethylene acetals and ketals to their corresponding alcohols and carbonyl compounds using oxone in refluxing acetonitrile is described. Excellent chemoselectivity of this method makes it a useful and practical procedure in organic synthesis.