Oxalyl chloride, (0.5 equiv) was found to cleave the PMB group from alkyl, aryl PMB ethers, and esters to give corresponding alcohol and acid in good yields. This method offers simple and efficient protocol for the selectivedeprotection of PMB ether and ester in DCE at ambient temperature.
A mild and efficient method for the selective cleavage of primary p-methoxybenzyl protecting group of saccharides by Co2(CO)8–Me2PhSiH–CO system
作者:Peng-zhan Qian、Wang Yao、Lu-bai Huang、Xiang-bao Meng、Zhong-jun Li
DOI:10.1016/j.tetlet.2015.07.051
日期:2015.9
A mild and efficient method to selectively cleave p-methoxybenzyl (PMB) ether with a catalytic amount of Co2(CO)8, hydrosilane and CO (1 atm) is presented. The cleavage reaction shows regioselectivity to primary O-PMB of a variety of permethoxybenzylated saccharides and chemoselectivity to O-Bn, sulfur-containing group and common ester protectinggroups.