Kilogram-Scale Synthesis of Osteogenic Growth Peptide (10–14) Using a Fragment Coupling Approach

Kilogram-scale synthesis of a bioactive pentapeptide in solution by "3 + 2" fragment coupling strategy has been successively accomplished in the development of OGP (10–14), a minimal OGP-derived sequence that retains the full proliferative activity of the osteogenic growth peptide. The synthetic scheme, coupling conditions, and scaling-up of the process are systematically studied; the epimerization of the tripeptide fragment and pentapeptide are also evaluated.