Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 132, Issue 38, Pages 13179-13181Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja1061196
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Funding
- NIGMS [GM73072-01, P50 GM086145-01]
- AstraZeneca
- Amgen
- GlaxoSmithKline
- Organic Reactions
- NSF [CHE-9871268]
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An efficient intermolecular conjugate addition of alcohols to activated alkenes catalyzed by N-heterocyclic carbenes has been developed. With 5 mol % of the free carbene derived from IMes center dot HCI, unsaturated ketones and esters are competent substrates, and a variety of primary and secondary alcohols can be employed as the nucleophile. No oligomerization is observed under these mild conditions for effective hydroalkoxylation. In addition to reactions with activated alkenes, IMes catalyzes the formation of vinyl ethers through the 1,4-addition of alcohols to ynones and promotes tandem conjugate addition/Michael cascade reactions. Preliminary data support a Bronsted base mechanism with the free carbene.
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