Cinacalcet-R-napthyl acylamine

Cinacalcet-R-napthyl acylamine is a stereoisomeric impurity derived from the calcimimetic drug Cinacalcet, featuring an R-configured naphthyl acyl group linked via an amide bond to the cyclohexylamine core. The naphthyl moiety introduces a fused aromatic system with a meta-substituted acyl chain, differing from the parent compound's indole-based pharmacophore. This structural divergence arises from a synthetic side reaction during Cinacalcet production, where naphthoyl chloride displaces the indole precursor. The compound serves as a critical HPLC reference standard for quantifying enantiomeric impurities in Cinacalcet APIs.