期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 36, 页码 10750-10754出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201704908
关键词
alkenes; amino acids; coupling reactions; hydantoin; urea
资金
- EPSRC
- Syngenta (CASE studentship)
- EPSRC [EP/L018527/1, EP/L018527/2, EP/K03927X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1331011, EP/K03927X/1, EP/L018527/1, EP/L018527/2] Funding Source: researchfish
alpha-Amino nitriles tethered to alkenes through a urea linkage undergo intramolecular C-alkenylation on treatment with base by attack of the lithionitrile derivatives on the N'-alkenyl group. A geometry-retentive alkene shift affords stereospecifically the E or Z isomer of the 5-alkenyl-4-iminohydantoin products from the corresponding starting E- or Z-N'-alkenyl urea, each of which may be formed from the same N-allyl precursor by stereodivergent alkene isomerization. The reaction, formally a nucleophilic substitution at an sp(2) carbon atom, allows the direct regioselective incorporation of mono-, di-, tri-, and tetrasubstituted olefins at the alpha-carbon of amino acid derivatives. The initially formed 5-alkenyl iminohydantoins may be hydrolyzed and oxidatively deprotected to yield hydantoins and unsaturated alpha-quaternary amino acids.
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