Novel Deprotection of SEM Ethers: A Very Mild and Selective Method Using Magnesium Bromide
作者:Alexandros Vakalopoulos、H. M. R. Hoffmann
DOI:10.1021/ol0057784
日期:2000.5.1
New lability and stability sequences have been established for multifunctional substrates containing SEM ether group(s) by a MgBr(2)/Et(2)O/MeNO(2) deprotection protocol.
An Efficient and Highly Selective Deprotecting Method for β-(Trimethylsilyl)ethoxymethyl Ethers
作者:Ming-Yi Chen、Adam Shih-Yuan Lee
DOI:10.1021/jo0107204
日期:2002.2.1
A series of beta-(trimethylsilyl)ethoxymethyl ethers were hydrolyzed to their corresponding alcohols in high yields by using a catalytic amount of CBr4 (15%) in MeOH under refluxing reaction conditions. The chemoselective deprotection between trialkylsilyl and beta-(trimethylsilyl)ethoxymethyl-protected alcohols can be achieved by using an alcohol with steric hindrance such as iPrOH. The selectivity also can be achieved in the CBr4/MeOH reaction mixture under ultrasonic reaction conditions.o