TES- and TBS-protected alcohols undergo deprotection in good to excellent yield upon heating with 1 equiv of BiOClO4-xH(2)O in CH2Cl2. TBDPS- and TIPS-protected 2degrees alcohols are more resistant to deprotection. The use of this method in selective desilylation is, however, limited to the deprotection of alkyl silyl ethers in the presence of TBDPS-protected phenols. (C) 2003 Elsevier Ltd. All rights reserved.
The silylation of alcohols using allylsilanes was catalyzed by cationic Au(I) and Pt(II) species, which were prepared in situ from the metal chlorides ([AuCl(PPh3)], PtCl2) and a silver salt. TBS-, TES-, and TIPS-protections of various alcohols and carboxylic acids could be possible.
We have found that the etherification of silyl-protected secondary alcohols proceeds smoothly in the presence of strontium metal using silyl chloride instead of the expensive, yet more reactive, and commonly used silyl triflate. The reaction occurred almost completely with various alcohols.
Diverse Site-Selective Transformation of Benzylic and Allylic Silyl Ethers via Organocatalytic Oxidation
作者:Shohei Hamada、Kaori Sakamoto、Eri Miyazaki、Elghareeb E. Elboray、Yusuke Kobayashi、Takumi Furuta
DOI:10.1021/acscatal.3c01153
日期:2023.6.16
the electronic properties of silylethers, thus enabling selective oxidation of benzylic and allylic silylethers, despite steric factors. A subsequent one-pot reduction accomplishes the formal deprotection to the corresponding benzylic and allylic alcohols. This catalytic system allows the direct oxidative desymmetrization of bis-benzylic and bis-allylic silylethers to access synthetically useful
Improved protocols for the selective deprotection of trialkylsilyl ethers using fluorosilicic acid
作者:Anthony S. Pilcher、Philip DeShong
DOI:10.1021/jo00071a023
日期:1993.9
Improvements for the application of aqueous fluorosilicic acid to the selective cleavage of tert-butyldimethylsilyl ethers in the presence of triisopropylsilyl ethers are described. Deprotection conditions have been optimized for cleavage selectivity, tolerance by acid-labile compounds, and cleavage rate. Mechanistic features of the desilylation reaction are discussed.
Deprotection of silyl ethers using ZnBr2 and H2O in CH2Cl2
作者:R.David Crouch、Joanna M. Polizzi、Rebecca A. Cleiman、Jihae Yi、Candice A. Romany
DOI:10.1016/s0040-4039(02)01680-5
日期:2002.9
TES- and TBS-protected alcohols undergo deprotection upon treatment with excess ZnBr2 and water in CH2Cl2 at 44-50degreesC. TIPS-protected alcohols also undergo deprotection but at slower rates. TBDPS-protected alcohols and silyl-protected phenols are unreactive under these conditions, allowing for selective deprotection of differentially-protected bis-silyl ethers. (C) 2002 Elsevier Science Ltd. All rights reserved.