A mild and selective cleavage of trityl ethers by CBr4–MeOH
作者:Jhillu S. Yadav、Basi V. Subba Reddy
DOI:10.1016/s0008-6215(00)00241-x
日期:2000.12
Trityl ethers are selectively deprotected to the corresponding alcohols in high yields by CBr4 in refluxing methanol under neutral reaction conditions. Other hydroxyl protectinggroups like isopropylidene, allyl, benzyl, acetyl, benzoyl, methyl, tosyl, prenyl, propargyl, tert-butyldiphenylsilyl and p-methoxybenzyl ethers are unaffected.
A highly selective method for the cleavage of trityl ethers over a wide range of functional groups has been developed using silica-supported sodium hydrogen sulfate (NaHSO4-SiO2) as a heterogeneous catalyst. The conversion occurred at room temperature and the yields of the alcohols were found to be excellent. (C) 2004 Elsevier Ltd. All rights reserved.