期刊
NATURE CHEMISTRY
卷 2, 期 3, 页码 192-196出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.518
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资金
- National Institute of Health's National Institute of General Medical Sciences [R01 GM 080269-01]
- German Academic Exchange Service
- Abbott Laboratories
- Amgen
- Amgen, Merck
- Bristol Myers Squibb
- Boehringer Ingelhiem
- Gordon and Betty Moore Foundation and Caltech
The catalytic enantioslective synthesis of densely functionalized organic moleucles that contain all-carbon quaternary stereocentres is a challenge to modern chemical methodology. The catalytically controlled, asymmetric alpha-alkylation of ketones represents another difficult task and is of major interest to our and other research groups. We report here a palladium-catalysed enantioselective process that addresses both problems simultaneously and allows the installation of vicinal all-carbon quaternary and tertiary stereocentres at the alpha-carbon of a ketone in a single step. This multiple bond-forming process is carried out on readily available beta-ketoester starting materials and proceeds by conjugate addition of a palladium enolate, generated in situ, to activated Michael acceptors. As a result, the CO2 moiety of the substrate is displaced by a C-C fragment in an asymmetric cut-and-paste reaction with high yield, diastereomeric ration and enantiomeric excess.
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