Journal
ORGANIC LETTERS
Volume 23, Issue 2, Pages 480-485Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.0c04004
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Funding
- JSPS KAKENHI [20K06948]
- Grants-in-Aid for Scientific Research [20K06948] Funding Source: KAKEN
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A new organocatalyst efficiently promotes the asymmetric direct vinylogous conjugate additions of alpha-angelica lactones to benzoyl acrylonitrile derivatives, resulting in products with excellent enantioselectivities. The chiral gamma,gamma-disubstituted gamma-butenolides obtained can be readily transformed to valuable synthetic intermediates.
A diaminomethylenemalononitrile organocatalyst efficiently promotes the asymmetric direct vinylogous conjugate additions of alpha-angelica lactones to benzoyl acrylonitrile derivatives, resulting in the corresponding addition products bearing vicinal tertiary and quaternary stereogenic centers with excellent enantioselectivities (up to 99% ee). This report is the first successful example of the asymmetric conjugate additions of alpha-angelica lactone to benzoyl acrylonitriles. The chiral gamma,gamma-disubstituted gamma-butenolides obtained can be readily transformed to the bicyclic gamma-lactam derivative as a valuable synthetic intermediate.
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