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.
Propargylethers treated with dimsyl anion in DMSO at 80–100°C undergo terminal methylenation to afford corresponding (E) 1-alkoxy-1,3-butadienes. The reaction proceeds via an alkoxy-allene.