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.
Silver(I)-Catalyzed Deprotection of <i>p</i>-Methoxybenzyl Ethers: A Mild and Chemoselective Method
作者:Nicolas Kern、Thomas Dombray、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo301787v
日期:2012.10.19
The p-methoxybenzyl protecting group (PMB) on various alcohols and an acid was efficiently and selectively, cleaved by the action of a catalytic amount of silver(I) hexafluoroantimonate combined with 0.5 equiv of 1,3,5-trimethoxybenzene in dichloromethane at 40 degrees C.