ammonium carbamates with trimethylchlorosilane. Trimethylsilyl NN-dimethylcarbamate can be used for silylation of alcohols,phenols, and carboxylicacids. The silycarbamates react with carboxylicacid halides to give the corresponding acide amides. The reaction of trimethylsilyl carbamates with carboxylicanhydrides give the corresponding silyl carboxylate and acid amide, while the reaction with dicarboxylic
Direct NHC-catalysed redox amidation using CO<sub>2</sub> for traceless masking of amine nucleophiles
作者:Robert W. M. Davidson、Matthew J. Fuchter
DOI:10.1039/c6cc04639h
日期:——
We report an amine masking strategy for N-heterocyclic carbene (NHC)-catalysed redox amidation that couples release of the free nucleophile to catalytic turnover, and in doing so, enables direct reaction of electron-rich amines.
A ruthenium-carbamato-complex derived from a siloxylated amine and carbon dioxide for the oxidative α-cyanation of aromatic and cyclic tertiary amines
作者:Subodh Kumar、Pawan Kumar、Suman L. Jain
DOI:10.1039/c3ra44051f
日期:——
The ruthenium carbamate complex derived from 3-trimethoxysilyl-1-propyl amine and carbon dioxide was found to be a novel catalyst for the oxidative cyanation of aromatic and cyclic tertiaryamines to corresponding α-aminonitriles in high to excellent yields by using hydrogen peroxide and molecular oxygen as enviro-economic oxidants. The developed protocol suggested an efficient alternative for recycling
Silyl carbamates are produced by the reaction under suitable reaction conditions of silanes bearing at least one silicon-hydrogen bond of the formula: R4-xSiHx with an ammonium carbamate of the formula: R'R"NH2R'R"NCO⊖2. This novel route is much simplier and more direct than those previously known and provides a new classes of silyl carbamates.
1,3-Dialkyl-2-imidazolidinones and a manufacturing process therefor
申请人:MITSUI CHEMICALS, INC.
公开号:EP0992497A1
公开(公告)日:2000-04-12
1,3-dialkyl-2-imidazolidinones are made by a process involving a direct one-step reaction from industrially available alkylene carbonate, N-alkylethanolamine or 1,2-diol; the process can minimize formation of solid material and can be readily conducted in a large-scale industrial production with high yield and few byproducts. The process is characterized in that alkylene carbonate, N-alkylethanolamine or 1,2-diol is reacted with monoalkylamine and carbon dioxide, alkylcarbamate alkylamine salt, and/or 1,3-dialkyurea, by heating them at 50°C or higher in a reactor whose area in contact with at least part of the reactants and/or products is made of a metal comprising titanium or zirconium and/or an oxide thereof, or an inorganic glass.