metal-free protocol for the synthesis of indenoquinolinones and 2-substituted quinolinesvia [4 + 2] cycloaddition reaction using readily available 2-aminobenzaldehydes and ketones as starting materials. Different quinoline derivatives can be selectively synthesized by changing the type of ketones. O2 and dimethyl sulfoxide (DMSO) as co-oxidants play an important role in the synthesis of indenoquinolinones
Synthesis of Quinolines, 2-Quinolones, Phenanthridines, and 6(5<i>H</i>)-Phenanthridinones via Palladium[0]-Mediated Ullmann Cross-Coupling of 1-Bromo-2-nitroarenes with β-Halo-enals, -enones, or -esters
作者:Martin G. Banwell、David W. Lupton、Xinghua Ma、Jens Renner、Magne O. Sydnes
DOI:10.1021/ol0490375
日期:2004.8.1
Palladium[0]-mediated Ullmann cross-coupling of 1-bromo-2-nitrobenzene (1 R = H) and its derivatives with a range of beta-halo-enals, -enones, or -esters readily affords the corresponding beta-aryl derivatives, which are converted into the corresponding quinolines, 2-quinolones, phenanthridines, or 6(5H)-phenanthridinones on reaction with dihydrogen in the presence of Pd on C or with TiCl3 in aqueous acetone.
Tilak et al., Indian Journal of Chemistry, 1970, vol. 8, p. 1,8