Synthesis of Macrocyclic Ttipeptidopyridine Schiff Base Candidates

Abstract

In the current study, a series of macrocyclic tripeptide Schiff bases 2–6 were synthesized by using macrocyclic tripeptide hydrazide 1 as starting material. Treatment of hydrazide 1 with active carbonyl cycloalkanones gave cycloalkanone hydrazines 2a–2d. Also, condensation of 1 with aromatic and heterocyclic aldehydes, or aromatic and heterocyclic acetyl derivatives afforded the corresponding Schiff base candidates 3a–3e, 4a–4c, 5a–5c, and 6a–6c, respectively.