Mimicking a proline tripeptide with pyrazolidines and a cyclopentane linker

Abstract In this work the five-step assembly of a peptidomimetic structurally resembling Prolyl-Prolyl-Proline tripeptide is reported. Proline units are mimicked by two pyrazolidine rings connected to trans -1,2-cyclopentanedicarboxylic acid. The Pro-Pro-Pro mimetic resembles a tri- l -proline unit but with increased lipophilicity and structural constraints imposed by the linker.