Palladium nanoparticles (PdNPs) prepared in neat glycerol containing TPPTS (tris(3-sulfophenyl)phosphine trisodium salt) or cinchona-based alkaloids (cinchonidine, quinidine) as capping agents, were applied as catalysts in fluoride-free Hiyama couplings and conjugate additions with the aim of evaluating the influence of the stabilizer in the catalytic reactivity. Therefore, PdNPs stabilized by phosphine
Hydroamination and Alcoholysis of Acrylonitrile Promoted by the Pincer Complex {κ<sup><i>P</i></sup>,κ<sup><i>C</i></sup>,κ<sup><i>P</i></sup>-2,6-(Ph<sub>2</sub>PO)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>}Ni(OSO<sub>2</sub>CF<sub>3</sub>)
作者:Abderrahmen B. Salah、Caroline Offenstein、Davit Zargarian
DOI:10.1021/om200549p
日期:2011.10.24
describes the catalyticactivity of the pincer-type complex κP,κC,κP-2,6-(Ph2PO)2C6H3}Ni(OSO2CF3) (1) in the anti-Markovnikov addition of aliphatic and aromatic amines and alcohols to acrylonitrile, crotonitrile, and methacrylonitrile. The influence of additives on the catalyticactivities was investigated, and it was found that substoichiometric quantities of water promoted the C–N bond forming reactions
Synthesis and Antiplatelet Activity of New Imidazole-4-Carboxylic Acid Derivatives
作者:Klaus Rehse、Jens Steege
DOI:10.1002/ardp.200500150
日期:2005.11
1‐Arylalkyl‐5‐phenylsulfonamino‐imidazole‐4‐carboxylic acid esters and their carboxamides with an additional secondary amino group were synthesized and identified as antiplatelet agents in a low micromolar range (Born‐test, inducer collagen). To describe the mechanism of action more precisely the Born‐test was carried out as well with ADP, adrenaline or PAF, respectively. In addition, two compounds
N.sup.1 -(1,2-dihydro-2-oxo-4-pyrimidinyl)sulfanilamides, bearing a lower alkyl, cycloalkyl or cycloalkyl-lower alkyl substituent in the 1-position, prepared by reaction of the corresponding 1-substituted-1,2-dihydro-2-oxo-4-aminopyrimidine and N-acylated sulfanilyl chloride with subsequent hydrolysis, are described. The end products are useful as antibacterial agents.
An efficient biomaterial supported bifunctional organocatalyst (ES-SO3− C5H5NH+) for the synthesis of β-amino carbonyls
作者:Sanny Verma、Suman L. Jain、Bir Sain
DOI:10.1039/c0ob00965b
日期:——
A biomaterial supported organocatalyst, readily synthesized by the reaction of chemically modified sulfonic group containing expanded corn starch with pyridine exhibited excellent catalytic activity for the synthesis of β-amino carbonyls in excellent yields via aza-Michael addition of amines to electron deficient alkenes. A remarkable enhancement in the reaction rates was observed with the prepared bifunctional organocatalyst in comparison to the either starch grafted sulfonic acid or the corresponding homogeneous pyridinium p-toluenesulfonate.