590372-17-1Relevant articles and documents
On the mechanism of the palladium-catalyzed tert-butylhydroperoxide- mediated wacker-type oxidation of alkenes using quinoline-2-oxazoline ligands
Michel, Brian W.,Steffens, Laura D.,Sigman, Matthew S.
supporting information; scheme or table, p. 8317 - 8325 (2011/07/08)
The mechanism of the tert-butylhydroperoxide-mediated, Pd(Quinox)-catalyzed Wacker-type oxidation was investigated to evaluate the hypothesis that a selective catalyst-controlled oxidation could be achieved by rendering the palladium coordinatively saturated using a bidentate amine ligand. The unique role of the Quinox ligand framework was probed via systematic ligand modifications. The modified ligands were evaluated through quantitative Hammett analysis, which supports a push-pull relationship between the electronically asymmetric quinoline and oxazoline ligand modules.
4-(Trifluoromethyl)quinoline derivatives
Lefebvre, Olivier,Marull, Marc,Schlosser, Manfred
, p. 2115 - 2121 (2007/10/03)
Under carefully controlled conditions, ethyl 4,4,4-trifluoroacetoacetate (ethyl 4,4,4-trifluoro-3-oxobutanoate) can be condensed with anilines and subsequently cyclized to give 4-trifluoromethyl-2-quinolinones 1 although only in poor yield. Heating these products with phosphoryl tribromide affords 2-bromo-4-(trifluoromethyl)quinolines 2 which can be converted into 4-(trifluoromethyl)quinolines 3 by reduction, 4-trifluoromethyl-2-quinolinecarboxylic acids 4 by permutational halogen/metal exchange followed by carboxylation, and 2-bromo-4-trifluoromethyl-3-quinolinecarboxylic acids 5 by consecutive treatment with lithium diisopropylamide and dry ice. Debromination of acids 5 makes 4-trifluoromethyl-3-quinolinecarboxylic acids 6 available. As at any time 2-trifluoromethyl-4-quinolinones 9 may form instead of the expected isomers 1, the structures have to be assigned on the basis of unequivocal NMR spectral criteria. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.