Scratch the surface: Dehydrocondensations between carboxylates and amines by using an amphiphilic 1,3,5‐triazinylammonium‐based coupling agent were accelerated by the interfacial effect of micelles and emulsions of commonsurfactants (see figure). The reaction of carboxylates was promoted by both anionic and nonionic surfactants, and that of amines was promoted by only a nonionic surfactant. High selectivities
Mesoporous silica MCM-41 as a highly active, recoverable and reusable catalyst for direct amidation of fatty acids and long-chain amines
作者:Kenichi Komura、Yu Nakano、Mamoru Koketsu
DOI:10.1039/c0gc00673d
日期:——
Direct amidation of fattyacids with long-chain amines was successfully performed by mesoporous silica MCM-41, which showed the highest catalytic activity among other used homo- and heterogeneous catalysts. It was found that MCM-41 can be easily recovered from the reaction mixture followed by simple calcination treatment and reused without loss of its catalytic activity.
Aminolysis of Carboxylic Acid Esters in Direct, Bicontinual, and Inverse Microemulsions Based on Cetyltrimethylammonium Bromide
作者:A. B. Mirgorodskaya、L. A. Kudryavtseva、L. S. Shtykova、I. V. Bogomolova、S. N. Shtykov
DOI:10.1007/s11176-005-0376-x
日期:2005.7
The reactivity of primary alkylamines in cleavage of p-nitrophenyl esters of carboxylic acids in microemulsions of different structures based on cetyltrimethylammonium bromide was studied. The aminolysis rate considerably increases in going from inverse to direct microemulsions, mainly owing to the concentration of the reactants in the boundary layer.
A simple NaOMe catalyst provides superior accessibility to a wide variety of functionalized amides including peptides through direct amination of esters in an atom-economical and environmentally benign way.