Synthesis and evaluation of aminophosphinic acid derivatives as inhibitors of renal dipeptidase

Renal dipeptidase (RDP) is an enzyme overexpressed in benign and malignant colorectal tumors. In an effort to identify potent inhibitors of this enzyme, a series of aminophosphinic acid derivatives were synthesized. Compounds 3a and 3c in which the phenyl ring was para substituted with F and Br and olefin with Z geometry, showed better inhibitory activity against RDP enzyme (IC50 = 5–6 nM).