A New and Efficient Synthesis of Unnatural Amino Acids and Peptides by Selective 3,3-Dimethyldioxirane Side-Chain Oxidation
摘要:
N-Boc derivatives of Leu, Met, Thr, Trp, and Pro, the properties of which resemble those of the respective alpha-amino acid residues present in proteins, rapidly oxidize in the presence of 3,3-dimethyldioxirane to give different products depending on the structure of the oxidizable group in the side chain. A high regioselectivity for the oxygen atom insertion into the gamma-CH bond of Leu residues with respect to the weaker alpha-CH bond was observed. A position selectivity in the oxidation of peptides containing more than one Leu residue was also found.
Regioselective oxyfunctionalization of peptides by dimethyldioxirane: tertiary C–H ς-bond oxygen atom insertion into leucine derivatives and leucine-containing dipeptides
A simple and straightforward approach to selective CâH
Ï-bond oxygen atom insertion into Leu residues on peptides using
dimethyldioxirane is described; this procedure is compatible with Gly,
Ala, Val, Ile and Phe residues.