Discovery of a Potent, Selective, Orally Bioavailable, and Efficacious Novel 2‑(Pyrazol-4-ylamino)-pyrimidine Inhibitor of the Insulin-like Growth Factor‑1 Receptor (IGF-1R)

Optimization of cellular lipophilic ligand efficiency (LLE) in a series of 2-anilino-pyrimidine IGF-1R kinase inhibitors led to the identification of novel 2-(pyrazol-4-ylamino)-pyrimidines with improved physicochemical properties. Replacement of the imidazo­[1,2-a]­pyridine group of the previously reported inhibitor 3 with the related pyrazolo­[1,5-a]­pyridine improved IGF-1R cellular potency. Substitution of the amino-pyrazole group was key to obtaining excellent kinase selectivity and pharmacokinetic parameters suitable for oral dosing, which led to the discovery of (2R)-1-[4-(4-{[5-chloro-4-(pyrazolo­[1,5-a]­pyridin-3-yl)-2-pyrimidinyl]­amino}-3,5-dimethyl-1H-pyrazol-1-yl)-1-piperidinyl]-2-hydroxy-1-propanone (AZD9362, 28), a novel, efficacious inhibitor of IGF-1R.