Discovery of Novel Pyrimidine Derivatives as Human Pin1 Covalent Inhibitors.

Pin1 (peptidyl-prolyl cis-trans isomerase NIMA-interacting 1) is a unique peptidyl-prolyl isomerase (PPIase), and inactivation of Pin1 with a covalent inhibitor is a potential strategy for developing anticancer agents. Herein, a series of sulfolane amino-substituted 2-chloro-5-nitropyrimidine derivatives were disclosed as structurally distinct covalent inhibitors toward Pin1, which were validated for their covalent binding to Cys113 of Pin1 by X-ray cocrystal structures of compounds (IC = 11.55 μM) and (IC = 3.