25186-47-4Relevant articles and documents
Oxygen Activated, Palladium Nanoparticle Catalyzed, Ultrafast Cross-Coupling of Organolithium Reagents
Heijnen, Dorus,Tosi, Filippo,Vila, Carlos,Stuart, Marc C. A.,Elsinga, Philip H.,Szymanski, Wiktor,Feringa, Ben L.
supporting information, p. 3354 - 3359 (2017/03/17)
The discovery of an ultrafast cross-coupling of alkyl- and aryllithium reagents with a range of aryl bromides is presented. The essential role of molecular oxygen to form the active palladium catalyst was established; palladium nanoparticles that are highly active in cross-coupling reactions with reaction times ranging from 5 s to 5 min are thus generated in situ. High selectivities were observed for a range of heterocycles and functional groups as well as for an expanded scope of organolithium reagents. The applicability of this method was showcased by the synthesis of the [11C]-labeled PET tracer celecoxib.
Regio- and chemoselective C-H chlorination/bromination of electron-deficient arenes by weak coordination and study of relative directing-group abilities
Sun, Xiuyun,Shan, Gang,Sun, Yonghui,Rao, Yu
, p. 4440 - 4444 (2013/05/22)
It's all relative: A practical and efficient PdII-catalyzed regio- and chemoselective chlorination/bromination has been developed for the facile synthesis of a broad range of aromatic chlorides. The reaction demonstrates excellent reactivity, good functional-group tolerance, and high yields. A preliminary study was conducted to evaluate relative directing-group abilities of various functionalities. Copyright
Cardiotonic Agents. Synthesis and Cardiovascular Properties of Novel 2-Arylbenzimidazoles and Azabenzimidazoles
Guengoer, Timur,Fouquet, Andre,Teulon, Jean-Marie,Provost, Daniel,Cazes, Michele,et al.
, p. 4455 - 4463 (2007/10/02)
Novel 2-arylbenzimidazoles and azabenzimidazoles were synthesized, and their inotropic action was evaluated.Changes in left ventricular pressure, dP/dt max, were measured as an index of cardiac contractility.The structural features that impart optimal inotropic activity are presented.The most potent compounds were evaluated orally in conscious dogs with implanted Konigsberg pressure transducers.To investigate the mechanism of action, the most potent compounds were tested for their calcium-sensitizing properties and their potential for the inhibition of phosphodiesterase.Two compounds, 1 and 41, showed interesting in vitro and oral activity without side effects.They have a more potent calcium-sensitizing effect than MCI-154 and are under further investigation.