Development of a Kilogram-Scale Synthesis of a Novel MC1R Agonist

Herein, we report the kilogram-scale synthesis of CD08108, a novel MC1R agonist. This synthesis has been developed to produce the first batches of this compound for preclinical and clinical studies. Two amido couplings were used to synthesize the backbone of the API. Improvements have been made to isolate crystalline intermediates and to remove all column chromatographic steps. Crystallization of the final API was monitored by DSC in-process control during slurry ripening of the amorphous suspension of the hydrochloride salt.