Bis(NHC)-Pd-catalyzed one-pot competitive C–C*C–C, C–C*C–O, C–C*C–N, and C–O*C–N cross-coupling reactions on an aryl di-halide catalyzed by a homogenous basic ionic liquid (TAIm[OH]) under base-free, ligand-free, and solvent-free conditions
作者:Yanfang Zhu、Guiyang Xu、Milad Kazemnejadi
DOI:10.1039/d1nj00067e
日期:——
competitive kinetics of C–C cross-couplingreactions (Heck, Suzuki, and Sonogashira) with C–N and C–Ocross-couplingreactions, and also differences in the kinetics of aryl halides, the coupling reactions could be selectively performed with a low amount of by-products. The competitive cross-couplingreactions were thus performed with high selectivity under mild reaction conditions.
(Benz)imidazo[1,2‐a]quinolinium Salts: Access via Unprecedented Regiospecific non‐AAIPEX Strategy and Study of Their Tunable Properties
作者:Somnath Bauri、Arya Ramachandran、Arnab Rit
DOI:10.1002/chem.202303744
日期:2024.3.20
An unprecedented access to monosubstituted cationic tricyclic heteroaromatic compounds (cPHACs), possessing tunable photo-physical/electrochemical properties and having structural resemblance with drug molecules, via Ru(II)-catalyzed tandem annulation cum aromatization following a non-AAIPEX protocol is reported. This methodology executes a range of intermediate steps e. g. double C−H activation, nucleophilic
Nouveaux inhibiteurs de métalloprotéases, leur procédé de préparation et les compositions pharmaceutiques qui les contiennent
申请人:ADIR ET COMPAGNIE
公开号:EP1065209A1
公开(公告)日:2001-01-03
Composés de formule (I) :
dans laquelle :
R1représente un atome d'hydrogène, d'halogène, un groupement alkyle ou alkoxy,
R2représente un groupement hydroxy, alkoxy ou -NHOH,
Ar1représente un groupement phénylène ou biphénylène,
Xreprésente un atome d'oxygène, de soufre, un groupement NR, un groupe -CO≡C- ou une liaison,
Rreprésente un atome d'hydrogène ou un groupement alkyle,
nreprésente un nombre entier compris entre 0 et 6 inclus,
Ar2représente l'un quelconque des groupements tels que définis dans la description,
leurs isomères ainsi que leurs sels d'addition à un acide ou à une base pharmaceutiquement acceptable.
Médicaments.
Nitrogen-rich copolymeric microsheets were synthesized through incomplete condensation of melamine and cyanuric chloride. The materials can be well-dispersed in polar solvent and perform excellently as supports or stabilizing agents for metal nanoparticles. The presence of nitrogen in the lattice improves their interaction with the copper nanoparticle precursor (Cu(II) ions). Monodispersed copper nanoparticles over these supports were obtained after reducing the absorbed precursors. The materials were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The catalytic C-N coupling reaction was selected as the model reaction to evaluate the catalytic performance of the supported nanoparticles. The catalysts show above 90% yield of coupling products and retain activity after a five-run recycling test. Surface chemistry and morphology transforming during the catalytic process was further investigated. Nitrogen-rich copolymeric microsheets were proven to be excellent supports and stabilizing agents for metal nanoparticles. (C) 2011 Elsevier B.V. All rights reserved.