Synthesis of Bradykinin Fragments and Their Analogs modified at a Phenylalanine Residue

Abstract

Bradykinin fragments and their analogs, Gly-X-Ser-Pro (X : L-Phe I, D-Phe II, L-Ala III, D-Ala IV, β-Ala V and Gly VI) and X-Ser-Pro (X : L-Phe VII and D-Phe VIII) were synthesized. Compounds I, II, V, VII and VIII prolonged the pentobarbital-induced sleeping time in mice at the dosage of 2.5 nmol per mouse.