Direct enantioselective hydrogenation of unsaturated compounds to generate chiral three-dimensional motifs is one of the most straightforward and important approaches in synthetic chemistry. We realized the Ru(II)-NHC-catalyzed asymmetrichydrogenation of 2-quinolones under mild reaction conditions. Alkyl-, aryl- and halogen-substituted optically active dihydro-2-quinolones were obtained in high yields
The radicalreaction of benzenethiol with S-4-pentynyl carbamothioates provides a valuable protocol for the tin-free generation of carbamoylradicals, which arise from intramolecular substitution at sulfur by the initial sulfanylvinyl radicals. This procedure can be usefully employed to achieve N-benzylcarbamoyl radical 5-exo and 4-exo cyclizations leading, respectively, to pyrrolidinones and azetidinones
Aryl radical cyclisations: Quinoline, isoquinolone, and 1-benzazepin-2-onerings via 6- and 7-exo cyclisations
作者:Andrew J. Clark、Keith Jones、Clive McCarthy、John M.D. Storey
DOI:10.1016/0040-4039(91)85099-q
日期:1991.6
The cyclisation of aryl radicals derived by treatment of aryl halides (1a), (1b), (4), (7a), (7b), and (10)with tri-n-butyltinhydride has been investigated.