1,4-Addition of aryl boronic acids to α,β-unsaturated ketones catalyzed by a CCC–NHC pincer rhodium complex
作者:Sean W. Reilly、Hannah K. Box、Glenn R. Kuchenbeiser、Ramel J. Rubio、Christopher S. Letko、Kandarpa D. Cousineau、T. Keith Hollis
DOI:10.1016/j.tetlet.2014.09.107
日期:2014.12
An air- and water-stable CCC–NHC pincer Rh complex catalyzed the 1,4-addition of aryl boronic acids to α,β-unsaturated ketones and aldehydes. This bench top method proceeds in eco-friendly solvents including methanol and water. The scope of boronic acids was expanded to include heterocyclic examples.
Wide bite angle diphosphine rhodium complexes: Synthesis, structure, and catalytic 1,4-addition of arylboronic acids to enones
作者:Brad P. Morgan、Rhett C. Smith
DOI:10.1016/j.jorganchem.2007.09.034
日期:2008.1
A rhodium complex [ClRh(CO)(L1)] featuring a wide bite angle diphosphine ligand (L1 = 1,3-bis(2-diphenylphosphinomethylphenyl)benzene) has been synthesized and structurally characterized. L1 supports a bite angle (P-M-P angle, beta) of 171.4 degrees in the trans-square planar complex. L1 was tested in Rh-catalyzed 1,4-addition reactions of arylboronic acids (six examples) to alpha,beta-unsaturated ketones (five examples). In mixed aqueous/cyclohexane solution at 60 degrees C, addition reactions proceed in up to quantitative yield with a 1: 1 arylboronic acid/enone ratio. Yields as high as 77% can be acquired even when one of the coupling partners is sterically encumbered 2,4,6-trimethylphenylboronic acid. (c) 2007 Elsevier B.V. All rights reserved.
Preparation of thermally stable and soluble mesitylcopper(I) and its application in organic synthesis
[EN] SUBSTITUTED DIHYDROPYRIDINES AND METHODS OF USE<br/>[FR] DIHYDROPYRIDINES SUBSTITUEES ET LEURS METHODES D'UTILISATION
申请人:CHEMOCENTRYX INC
公开号:WO2007051062A2
公开(公告)日:2007-05-03
[EN] Compounds are provided that are modulators of the C5a receptor. The compounds are substituted dihydropyridines and are useful in pharmaceutical compositions, methods for the treatment of diseases and disorders involving the pathologic activtation of C5a receptors. [FR] L'invention porte sur des composés modulateurs du récepteur C5a. Lesdits composés sont des dihydropyridines substituées utilisables dans des préparations pharmaceutiques. L'invention porte également sur des méthodes de traitement de maladies et de troubles impliquant l'activation pathologique du récepteur C5a.
Organo[2-(hydroxymethyl)phenyl]dimethylsilanes as Mild and Reproducible Agents for Rhodium-Catalyzed 1,4-Addition Reactions
achievement of the corresponding enantioselective transformations using the tetraorganosilicon reagents, providing the silicon-based approach to opticallyactiveketones and substituted piperidones that serve as synthetic intermediates of pharmaceuticals. A rhodium alkoxide species is suggested to be responsible for a transmetalation step on the basis of the observed kinetic resolution of a racemic chiral phenylsilane