4-Aryl-2-quinolones from 3,3-Diarylacrylamides through Intramolecular Copper-Catalyzed C–H Functionalization/C–N Bond Formation
摘要:
Free NH 3,3-diarylacrylamides are cyclized to substituted 2-quinolones in the presence of CuI, PPh3, and KO-t-Bu in o-xylene at 100 degrees C. The reaction proceeds through a C-H functionalization/C-N bond formation process. With unsymmetrical 3,3-diarylacrylamides, high selectivity is observed using substrates where the aromatic ring trans to the amide group bears o-methyl, -chloro, or -bromo substituents.
Practical Route to 2-Quinolinones via a Pd-Catalyzed C–H Bond Activation/C–C Bond Formation/Cyclization Cascade Reaction
作者:Junliang Wu、Shaohua Xiang、Jing Zeng、Minli Leow、Xue-Wei Liu
DOI:10.1021/ol503292p
日期:2015.1.16
Quinolinone derivatives were constructed via a Pd-catalyzed C–H bond activation/C–Cbondformation/cyclization cascade process with simple anilines as the substrates. This finding provides a practical procedure for the synthesis of quinolinone-containing alkaloids and drug molecules. The utility of this method was demonstrated by a formal synthesis of Tipifarnib.