Synergistic Peptide and Gold Catalysis: Enantioselective Addition of Branched Aldehydes to Allenamides
Open Access
- 8 September 2021
- journal article
- research article
- Published by Wiley in Chemistry – A European Journal
- Vol. 27 (70), 17559-17564
- https://doi.org/10.1002/chem.202103197
Abstract
The combination of a peptide catalyst and a gold catalyst is presented for enantioselective addition reactions between allenamides and branched aldehydes. The two catalysts act in concert to provide γ,δ-enamide aldehydes bearing a fully substituted, benzylic stereogenic center – a structural motif common in many natural products and therapeutically active compounds – with good yields and enantioselectivities. The reaction tolerates a variety of alkyl and alkoxy aldehydes and the products can be elaborated into several chiral building blocks bearing either 1,4- or 1,5- functional group relationships. Mechanistic studies showed that the conformational features of the peptide are important for both the catalytic efficiency and stereochemistry, while a fine balance of acid/base additives is key for ensuring formation of the desired product over undesired side reactions.Funding Information
- Horizon 2020 Framework Programme (Grant No 862081)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (200020_188729)
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