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Abstract

Protected peptides were prepared by fragment condensation according to the scheme 6 + 3 or 9 + 3, which, after the removal of the protecting groups by sodium in liquid ammonia and oxidative cyclization, afforded [7-glycine,8-ornithine]vasopressin, [7-glycine,8-ornithine]deaminovasopressin, and N^α-glycyl-glycyl-glycyl[7-glycine,8-ornithine]vasopressin. All the analogues had very low intrinsic vasopressin-like activities; the analogue with hormonogen nature had a depressor effect and inhibited the pressor action of lysine-vasopressin.