Boc2O and DMAP were used to protect hindered phenols as their Boc derivatives under mild conditions. Deprotection conditions were developed to suppress loss of a tert-butylgroup from the aromatic ring, or alkylation of an additional tert-butylgroup at an unsubstituted ortho or para position.
作者:David E. Bergbreiter、Philip L. Osburn、Chunmei Li
DOI:10.1021/ol017198s
日期:2002.3.1
[structure: see text] Azo benzene derivatives were incorporated into soluble polymer-bound catalysts by two different approaches. The first was to attach the dye to the polymer-bound catalysts, using the dye as an innocent spectator to study the phase preference, concentration, and recoverability of a catalyst. The second approach used an azodye as a ligand to form an effective soluble polymer-bound Pd(II)
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.
Base-labile tert-butoxycarbonyl (Boc) group on phenols
Phenols are deprotected with weak bases from their tert-butoxycarbonyl (Boc) derivatives. Boc deprotection with bases can avoid side reactions during the deprotection with acids. We note the lability of the Boc to bases and are able to utilize it as a new cleavage condition for synthetic studies. (C) 2003 Elsevier Ltd. All rights reserved.