Simple and Convenient Methods for N-Arylation of Heterocycles and Diphenylamine
作者:Mariappan Periasamy、Laxhmaiah Alakonda
DOI:10.1055/s-0031-1290162
日期:2012.4
Abstract N-Arylation of NH-heterocycles and diphenylamine with various aryl halides, using a readily accessible ligand-free potassium tert-butoxide/iron(III) oxide/dimethyl sulfoxide reagent system, gives the corresponding N-aryl derivatives in 47–97% yields. N-Arylation of NH-heterocycles and diphenylamine with various aryl halides, using a readily accessible ligand-free potassium tert-butoxide/iron(III)
Regiocontrolled Synthesis of 1,2-Diaryl-1H-imidazoles by Palladium- and Copper-Mediated Direct Coupling of 1-Aryl-1H-imidazoles with Aryl Halides under Ligandless Conditions
作者:Fabio Bellina、Silvia Cauteruccio、Luisa Mannina、Renzo Rossi、Stéphane Viel
DOI:10.1002/ejoc.200500636
日期:2006.2
involving the formation of an organocopper(I) derivatives followed by a transmetallation reaction with an arylpalladium(II) halide species and a reductive elimination, is proposed. New one-step procedures for the synthesis of 1,2,5-triaryl-1H-imidazoles, based on palladium- and copper-mediated arylation of 1-aryl-1H-imidazoles, have also been developed. Interestingly, some imidazole derivatives prepared in
Heteroaryl-Substituted Naphthalenes and Structurally Modified Derivatives: Selective Inhibitors of CYP11B2 for the Treatment of Congestive Heart Failure and Myocardial Fibrosis
作者:Marieke Voets、Iris Antes、Christiane Scherer、Ursula Müller-Vieira、Klaus Biemel、Catherine Barassin、Sandrine Marchais-Oberwinkler、Rolf W. Hartmann
DOI:10.1021/jm0503704
日期:2005.10.1
a novel strategy for the treatment of congestive heart failure and myocardial fibrosis. In this study the synthesis and biological evaluation of heteroaryl-substituted naphthalenes and quinolines (1-31) is described. Key step for the preparation of the compounds was a Suzuki cross-coupling. Activity of the compounds was determined in vitro using human CYP11B2 and selectivity was evaluated toward the
Optically Active Iridium Imidazol-2-ylidene-oxazoline Complexes: Preparation and Use in Asymmetric Hydrogenation of Arylalkenes
作者:Marc C. Perry、Xiuhua Cui、Mark T. Powell、Duen-Ren Hou、Joseph H. Reibenspies、Kevin Burgess
DOI:10.1021/ja028142b
日期:2003.1.1
+89% enantiomeric excess); a transformation from one prevalent mechanism to another is inferred from this. The studies of pressure dependence revealed that many reactions proceeded with high conversions, and optimal enantioselectivities in approximately 2 h when only 1 bar of hydrogen was used. Deuterium-labeling experiments provide evidence for other types of competing mechanisms that lead to D-incorporation
Synthetic Approaches to Sterically Hindered<i>N</i>-Arylimidazoles through Copper-Catalyzed Coupling Reactions
作者:Ermitas Alcalde、Immaculada Dinarès、Sandra Rodríguez、Cristina Garcia de Miguel
DOI:10.1002/ejoc.200400453
日期:2005.4
Optimization studies allowed the efficient synthesis of a simple structural motif based on meta-bis(1-imidazolyl)benzenes 1 throughcopper-catalyzedcoupling of 1,3-diiodobenzene and imidazole under mild reaction conditions. This protocol was then used to prepare a representative sterically hindered N-arylimidazole 2a, the most common structural motif among N-heterocyclic carbenes (NHC). Having optimized the