Pieroni O, Bacciola D, Fissi A, Felicioli RA, Balestreri E. Asymmetric hydrogenation of unsaturated peptides.
INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 2009;
10:107-12. [PMID:
892985 DOI:
10.1111/j.1399-3011.1977.tb02783.x]
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Abstract
Eleven unsaturated peptides, containing one or two dehydro-phenylalanyl (dehydro-Phe) residues and a C-terminal L-amino acid have been hydrogenated in the presence of palladium-on-charcoal. Hydrolysis of the saturated peptides thus obtained gave optically active phenylalanine showing the occurrence of asymmetric induction during the hydrogenation. Both mono-unsaturated dipeptides and doubly unsaturated tripeptides with L-Glu, L-Leu and L-Val as chiral end-group afforded L-Phe in 40-50% optical yield. In the case of the tripeptide N-acetyl-(dehydro-Phe)-(dehydro-Tyr)-L-Glu the asymmetric induction was higher (70%) for the unsaturated residue which is farther from the chiral end-group along the peptide chain. The results are discussed on the bases of Prelog rule and the rigid dissymmetric conformation of the dehydropeptides in solution.
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