PMID: 19819693

Authors:

Boezio AA, Berry L, Albrecht BK, Bauer D, Bellon SF, Bode C, Chen A, Choquette D, Dussault I, Fang M, Hirai S, Kaplan-Lefko P, Larrow JF, Lin MH, Lohman J, Potashman MH, Qu Y, Rex K, Santostefano M, Shah K, Shimanovich R, Springer SK, Teffera Y, Yang Y, Zhang Y, Harmange JC

Title:

Discovery and optimization of potent and selective triazolopyridazine series of c-Met inhibitors.

Journal:

Bioorg Med Chem Lett. 2009 Nov 15;19(22):6307-12. Epub 2009 Sep 27.

Abstract:

Deregulation of the receptor tyrosine kinase c-Met has been implicated in several human cancers and is an attractive target for small molecule drug discovery. We previously showed that O-linked triazolopyridazines can be potent inhibitors of c-Met. Herein, we report the discovery of a related series of N-linked triazolopyridazines which demonstrate nanomolar inhibition of c-Met kinase activity and display improved pharmacodynamic profiles. Specifically, the potent time-dependent inhibition of cytochrome P450 associated with the O-linked triazolopyridazines has been eliminated within this novel series of inhibitors. N-linked triazolopyridazine 24 exhibited favorable pharmacokinetics and displayed potent inhibition of HGF-mediated c-Met phosphorylation in a mouse liver PD model. Once-daily oral administration of 24 for 22days showed significant tumor growth inhibition in an NIH-3T3/TPR-Met xenograft mouse efficacy model.