Amino acids and peptides. XXIX. Synthesis of peptide fragments related to active center of eglin c and studies on the relationship between their structure and their inhibitory activity against cathepsin G and .ALPHA.-chymotrypsin.
Rapid synthesis of acid azides via in situ generation of acid chlorides using CPICl as chlorinating agent from the corresponding Nα-protected amino acids is described. Also the conversion of acid azides into ureidopeptides through the Curtius rearrangement under ultrasonication is delineated. The mildness of the protocol renders the acid-sensitive substrates to afford the corresponding amino acid azides