Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 33, Pages 10098-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja073987e
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Funding
- NIGMS NIH HHS [R01 GM73072, R01 GM073072-01A2, R01 GM073072] Funding Source: Medline
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The enantioselective synthesis of alpha,alpha-disubstituted cyclopentenes using N-heterocyclic carbene catalysis is reported. This desymmetrization reaction proceeds via a chiral enol generated in situ from the combination of an enantiopure azolium salt and alpha,beta-unsaturated aldehyde. This reactive enol undergoes addition to one of two enantiotopic ketones to afford an optically active beta-lactone after the intermediate carbinol is involved in an internal acylation event to release the carbene catalyst. In the substrates where R = aryl, a decarboxylation occurs immediately after lactone formation to produce the quaternary center-containing cyclopentene products in up to 96% ee. When the R group is alkyl, the beta-lactones are isolated in moderate yield and high diastereo- and enantioselectivity.
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