Saccharin sulfonic acid catalyzed N-Boc protection of amines and formation of tert-butyl ethers from alcohols
作者:F. Shirini、M. A. Zolfigol、M. Abedini
DOI:10.1007/bf03246047
日期:2010.9
(SaSA), as a stable reagent is easily prepared by the reaction of saccharin with neat chlorosulfonic acid at room temperature. This compound is able to catalyze conversion of amines to their corresponding N-Boc protected amines with (Boc)2O. Alcohols were also converted to their corresponding tert-butyl ethers. All reactions took place under mild conditions giving the desired products in good to high
[EN] MOLECULARLY TUNABLE HETEROGENEOUS CATALYSTS BY EDGE FUNCTIONALIZATION OF GRAPHITIC CARBONS<br/>[FR] CATALYSEURS HÉTÉROGÈNES MODIFIABLES MOLÉCULAIREMENT PAR UNE FONCTIONNALISATION TERMINALE DE CARBONES GRAPHITIQUES
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2017031050A1
公开(公告)日:2017-02-23
Disclosed are surface immobilized (electro)catalysts that may be prepared by a condensation reaction that generates an aromatic unit that is robust to acid and base and elevated temperatures. Among their many desirable characteristics, the catalysts are far less prone to the bimolecular deactivation pathways commonly observed for homogeneous catalysts, and may be used in solvents with a range of polarities and dielectric strengths. The catalysts are suitable for a wide array of thermal catalytic reactions (polymerization, oxidation, hydrogenation, cross- coupling etc. ) and as anodes and or cathodes in fuel cells, electrolyzers, and in batteries and supercapacitors.
A class of novel 1H-indole-3-acetic acid hydrazides is disclosed together with the use of such indole compounds for inhibiting sPLA.sub.2 mediated release of fatty acids (e.g., arachidonic acid) for treatment of conditions such as septic shock.
HClO<sub>4</sub>–SiO<sub>2</sub>as a new, highly efficient, inexpensive and reusable catalyst for N-tert-butoxycarbonylation of amines
作者:Asit K. Chakraborti、Sunay V. Chankeshwara
DOI:10.1039/b605074c
日期:——
Perchloric acid adsorbed on silica-gel (HClO4âSiO2) was found to be a new, highly efficient, inexpensive and reusable catalyst for chemoselective N-tert-butoxycarbonylation of amines at room temperature and under solvent-free conditions.
Visible-Light-Mediated Nitration of Protected Anilines
作者:Simon J. S. Düsel、Burkhard König
DOI:10.1021/acs.joc.7b03260
日期:2018.3.2
The photocatalytic nitration of protected anilines proceeds with riboflavin tetraacetate as an organic photoredox catalyst. Sodium nitrite serves as the NO2 source in this visible-light-driven room temperature reaction. Various nitroanilines are obtained in moderate to good yields without the addition of acid or stoichiometric oxidation agents. The catalytic cycle is closed by aerial oxygen as the