Synthesis of artificial glycoconjugates of arginine-vasopressin and their antidiuretic activities

Arginine-vasopressin (AVP) derivatives modified at the glutamine side chain amide with carbohydrate via an alkylene spacer (1a--d) were synthesized from new glycosylated glutamine derivatives (3a--d) by solid-phase synthesis. Glycoconjugates of AVP modified at the C-terminal amide (2a--d) were also synthesized from vasopressionic acid. All of them exhibited antidiuretic activity.