6-aryl pyrazolo\x9b3,4-D! pyrimidin-4-ones and compositions and method of
申请人:Sanofi
公开号:US05736548A1
公开(公告)日:1998-04-07
6-Aryl pyrazolo\x9b3,4-d!pyrimidin-4-one derivatives, pharmaceutical compositions containing them and methods for effecting c-GMP-phosphodiesterase inhibition and for treating heart failure and/or hypertension.
Framework-Copper-Catalyzed C−N Cross-Coupling of Arylboronic Acids with Imidazole: Convenient and Ligand-Free Synthesis of N-Arylimidazoles
作者:Nainamalai Devarajan、Palaniswamy Suresh
DOI:10.1002/cctc.201600480
日期:2016.9.21
A convenient and environmentally benign synthesis of N‐arylimidazoles has been demonstrated by a straightforward reaction catalyzed by the unsaturated coordination sites of Cu in the copper terephthalate metal–organic framework (Cu(tpa)‐MOF). A series of N‐arylimidazoles has been synthesized in excellent yields by the C−N cross‐coupling reaction of arylboronic acids and imidazoles catalyzed by the
new chiral CCN Rh catalysts containing N‐heterocyclic carbene and oxazoline hybrid ligands is described. The catalytic reaction of fluoroalkyl‐substituted ketones, ArCOCF2X (X=F, Cl, H), with aromatic and aliphatic alkynes yielded the corresponding chiral propargyl alcohols with high enantioselectivity. Control and kinetic experiments suggested a bis(alkynyl) Rh intermediate as the active species for
High-performance sono/nano-catalytic system: CTSN/Fe<sub>3</sub>O<sub>4</sub>–Cu nanocomposite, a promising heterogeneous catalyst for the synthesis of <i>N</i>-arylimidazoles
High-performance sono/nano-catalytic system: CTSN/Fe3O4–Cu nanocomposite, a promising heterogeneous catalyst for the synthesis of N-arylimidazoles with high yields.
Copper-Catalyzed N-Arylation of Imidazoles and Benzimidazoles
作者:Ryan A. Altman、Erica D. Koval、Stephen L. Buchwald
DOI:10.1021/jo070807a
日期:2007.8.1
10-phenanthroline (L1c) was found to be an efficientligand for the copper-catalyzed N-arylation of imidazoles and benzimidazoles with both aryl iodides and bromides under mild conditions. Further optimization of the system has revealed that the addition of poly(ethylene glycol) accelerates this reaction. A variety of hindered and functionalized imidazoles, benzimidazoles, and aryl halides were transformed in good