Mixed metal MgO-ZrO2 nanoparticle-catalyzed O-tert-Boc protection of alcohols and phenols under solvent-free conditions
作者:Manoj B. Gawande、Sharad N. Shelke、Paula S. Branco、Anuj Rathi、Rajesh K. Pandey
DOI:10.1002/aoc.2846
日期:2012.8
method for O‐tert‐Boc protection of alcohols and phenols catalyzed by MgO–ZrO2 nanoparticles under solvent‐free conditions is described. A variety of phenols, alcohols (aliphatic and aromatic) were converted to corresponding O‐tert‐Boc products in good to excellent yield (50–95%). The present protocol is expedient, simple, and efficient under solvent‐free conditions. The MgO–ZrO2 Nps are easily prepared
Chemoselective O-tert-butoxycarbonylation of phenols using 6,7-dimethoxyisoquinoline as a novel organocatalyst
作者:Yukako Saito、Yuichi Yoshimura、Hiroki Takahata
DOI:10.1016/j.tetlet.2010.10.114
日期:2010.12
The chemoselective O-tert-butoxycarbonylation of phenols using low levels (5-0.1 mol %) of 6,7-dimethoxyisoquinoline as a reusableorganocatalyst is described. (C) 2010 Elsevier Ltd. All rights reserved.
MgBr<sub>2</sub> · OEt<sub>2</sub>: A Lewis Acid Catalyst for the <i>O</i>- and <i>N</i>-Boc Protection of Phenols and Amines
作者:Aaron Schechter、David Goldrich、Jessica R. Chapman、Beatrix M. Uberheide、Daniel Lim
DOI:10.1080/00397911.2014.976348
日期:2015.3.4
MgBr2 center dot OEt2 efficiently catalyzes the O- and N-tert-butoxycarbonylation of functionalized phenols and amines. The presented procedure is operationally simple and done under solvent-free conditions.