Stereoselective terminal functionalization of small peptides for catalytic asymmetric synthesis of unnatural peptides.

ABSTRACT: The asymmetric phase-transfer catalytic alkylation of peptides has been achieved by the use of designed C(2)-symmetric chiral quaternary ammonium bromide 1 as catalyst. Excellent stereoselectivities were uniformly observed in the alkylation with a variety of alkyl halides and the efficiency of the transmission of stereochemical information was not affected by the side-chain structure of the preexisting amino acid residues. This method also enables an asymmetric construction of noncoded alpha,alpha-dialkyl-alpha-amino acid residues at the peptide terminal. Since this chirality can be efficiently transferred to the adjacent amino acid moiety, our approach provides a general procedure not only for the highly stereoselective terminal functionalization of peptides but also for the sequential as

SUBMITTER: Maruoka K 

PROVIDER: S-EPMC395993 | biostudies-literature | 2004 Apr

REPOSITORIES: biostudies-literature