Crystal structure of 4-[(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl] 2-methyl (2S,4S,5R)-1-[(2S,3R,5R)-5-methoxycarbonyl-2-(2-methylphenyl)pyrrolidine-3-carbonyl]-5-(2-methylphenyl)pyrrolidine-2,4-dicarboxylate

Abstract

The title compound, C38H50N2O7, represents a chiral β-proline dipeptide. Corresponding stereogenic centres of constituting pyrrolidine units have opposite absolute configurations. The central amide fragment is planar within 0.1 Å and adopts a Z configuration along the N—CO bond. In the crystal, the hydrogen atoms of the methylene groups form several short intermolecular C—H...O contacts with the carbonyl oxygen atoms of an adjacent molecule. The only active amino hydrogen atom is not involved in hydrogen bonding.

Keywords

• β-proline oligomers
• β-peptides
• peptide bond configuration
• crystal structure