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.
A mild method for the protection of alcohols using a para-methoxybenzylthio tetrazole (PMB-ST) under dual acid–base activation
作者:Santosh R. Kotturi、Jason S. Tan、Martin J. Lear
DOI:10.1016/j.tetlet.2009.07.020
日期:2009.9
With a view to expand the repertoire of chemoselective methods applicable to sensitive and multifunctional substrates, the p-methoxybenzylation of alcohols under essentially neutral conditions is reported. This was achieved by the silver triflate (AgOTf) activation of 5-(p-methoxybenzylthio)-1-phenyl-1H-tetrazole (PMB-ST) in the presence of 2,6-di-tert-butyl-4-methylpyridine (DTBMP). (c) 2009 Elsevier Ltd. All rights reserved.
Oxidative photoredox catalysis: mild and selective deprotection of PMB ethers mediated by visible light
作者:Joseph W. Tucker、Jagan M. R. Narayanam、Pinkey S. Shah、Corey R. J. Stephenson
DOI:10.1039/c1cc10827a
日期:——
Herein we report an advancement in the application of visible light photoredox catalysts in the oxidation of electron-rich arenes resulting in the selectivedeprotection of para-methoxybenzyl (PMB) ethers. This method is highlighted by excellent functional group tolerance, protecting group orthogonality, mild reaction conditions and avoidance of stoichiometric redox byproducts.
Oxidative Deprotection of <i>p</i>-Methoxybenzyl Ethers via Metal-Free Photoredox Catalysis
作者:Deok Kyun Ahn、Young Woo Kang、Sang Kook Woo
DOI:10.1021/acs.joc.8b02951
日期:2019.3.15
method for p-methoxybenzyl (PMB) ethers using a metal-free visible light photoredox catalyst and air and ammonium persulfate as the terminaloxidants is presented. Various functional groups and protectinggroups were tolerated in the developed method to achieve good to excellent yields in short reaction times. Significantly, the developed method was compatible with PMB ethers derived from primary, secondary