4-Dimethylaminopyridine-catalyzed reaction of mixed carbonates 3 with N-protected amino acids 4 gave the corresponding active esters 5-9, from which dipeptides 11-18 were synthesized by aminolysis with amino acids 10.
Z-Gly-Val-Ser-Phe-Val-Leu-OMe and related peptides were synthesized by the conventional solution method and their attractant and repellent activities for Aedes aegypti (mosquito) and Blattella germanica (cockroach) were examined. Z-Val-Leu-OMe exhibited potent repellent activity against not only Aedes aegypti but also Blattella germanica.