Application of the 'direct amide cyclization' to peptides containing an anthranilic acid residue
The 2,2-disubstituted 2H-azirin-3-amines 7a-7c were used as amino acid synthons to prepare linear peptides derived from anthranilic acid. These linear peptides, which contain α,α-disubstituted α-amino acids, were synthesized by using the 'azirine/oxazolon