Copper + Nickel-in-Charcoal (Cu−Ni/C): A Bimetallic, Heterogeneous Catalyst for Cross-Couplings
作者:Bruce H. Lipshutz、Danielle M. Nihan、Ekaterina Vinogradova、Benjamin R. Taft、Žarko V. Bošković
DOI:10.1021/ol801676u
日期:2008.10.2
catalyst composed of copper and nickel oxide particles supported within charcoal has been developed. It catalyzes cross-couplings that traditionally use palladium, nickel, or copper, including Suzuki-Miyaura reactions, Buchwald-Hartwig aminations, vinylalane alkylations, etherifications of arylhalides, arylhalide reductions, asymmetric conjugate reductions of activated olefins, and azide-alkyne "click"
Nucleophilic displacement in 2-chloro(trifluoromethyl)pyridines with amines and ammonia
作者:A.D Dunn
DOI:10.1016/s0022-1139(98)00308-x
日期:1999.2
The activating effect of trifluoromethyl groups in 2-chloro(trifluoromethyl)pyridines was investigated by comparing reactions of these compounds and of 2-chloropyridine with secondary cyclic amines. The ammonolysis of 2-chloro-3-trifluoromethylpyridine and 2-chloro-4-trifluoromethylpyridine is also reported and shown to proceed, in contrast to the reported behaviour of 2-chloro-5-trifluoromethylpyridine, without hydrolysis of the trifluoromethyl function. Both 2-amino-3-trifluoromethylpyridine and 2-amino-4-trifluoromethylpyridine were converted (via the corresponding pyridones) to 3-trifluoromethylpyridin-2(1H)-thione and 4-trifluoromethylpyridin-2(1H)-thione, and a number of S-alkyl derivatives of the latter compounds were prepared. (C) 1999 Elsevier Science S.A. All rights reserved.
[EN] PHOSPHINE REAGENTS FOR AZINE FLUOROALKYLATION<br/>[FR] RÉACTIFS DE PHOSPHINE POUR FLUOROALKYLATION D'AZINE