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An efficient carbene-catalyzed access to 3,4-dihydrocoumarins
Kirsten Zeitler1, Christopher A Rose
1Institut für Organische Chemie, Universität Regensburg, D-93053 Regensburg, Germany. kirsten.zeitler@chemie.uni-regensburg.de
Dihydrocoumarins, important flavor and fragrance compounds, are efficiently synthesized from o-hydroxycinnamaldehydes using N-heterocyclic carbene catalysis. This method offers a mild and atom-economic route to these valuable molecules.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- Dihydrocoumarins are significant compounds in the flavor and fragrance industries.
- Efficient synthesis of dihydrocoumarins and coumarins is crucial for their application.
Purpose of the Study:
- To develop a mild and atom-economic method for synthesizing dihydrocoumarins.
- To establish a one-pot procedure for accessing corresponding coumarins.
Main Methods:
- N-heterocyclic carbene-catalyzed redox lactonization of o-hydroxycinnamaldehydes.
- One-pot domino oxidation lactonization using oxidants.
Main Results:
- Efficient preparation of dihydrocoumarins from o-hydroxycinnamaldehydes.
- Successful synthesis of coumarins via a domino oxidation lactonization pathway.
Conclusions:
- N-heterocyclic carbene catalysis provides an effective route to dihydrocoumarins.
- The developed methods are efficient and atom-economic for producing flavor and fragrance compounds.
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