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A series of linear tetrapeptides  2–7  and cyclooctapeptedopyridine derivatives  8  and  9 , were synthesized using  N α  -dinicotinoyl-bis[( l -phenylalaninyl- l -leucyl)hydrazide]  2  as starting material. Acid hydrazide  2  was reacted with aromatic or heterocyclic aldehydes to give Schiff base derivatives  3  and  4 , respectively. Additionally, compound  2  was reacted with dicarboxylic acid anhydrides ortetracarboxylic diacid anhydrides to give the corresponding linear diimide carboxamides  5–7 , and octapeptide tetraimides  8  and  9 , respectively. The synthesized products were elucidated by using spectroscopic evidences and they were evaluated for their antibacterial activity by using streptomycin as reference antibiotic drug.

zeitschrift für naturforschung b

Synthesis of chiral 3,5-bis( l -phenylalaninyl- l -leucinyl)pyridine Schiff base and their macrocyclic carboxaimide derivatives using 3,5-bis( l -phenylalaninyl)-pyridine methyl ester