Design and Synthesis of Tri-Ring P<sub>3</sub> Benzamide-Containing Aminonitriles as Potent, Selective, Orally Effective Inhibitors of Cathepsin K
作者:James T. Palmer、Clifford Bryant、Dan-Xiong Wang、Dana E. Davis、Eduardo L. Setti、Robert M. Rydzewski、Shankar Venkatraman、Zong-Qiang Tian、Leland C. Burrill、Rohan V. Mendonca、Eric Springman、John McCarter、Tobee Chung、Harry Cheung、James W. Janc、Mary McGrath、John R. Somoza、Philip Enriquez、Z. Walter Yu、Robert M. Strickley、Liang Liu、Michael C. Venuti、M. David Percival、Jean-Pierre Falgueyret、Peppi Prasit、Renata Oballa、Denis Riendeau、Robert N. Young、Gregg Wesolowski、Sevgi B. Rodan、Colena Johnson、Donald B. Kimmel、Gideon Rodan
DOI:10.1021/jm058198r
日期:2005.12.1
We have prepared a series of achiral aminoacetonitriles, bearing tri-ring benzamide moieties and an aminocyclohexanecarboxylate residue at P-2. This combination of binding elements resulted in sub-250 pM, reversible, selective, and orally bioavailable cathepsin K inhibitors. Lead compounds displayed single digit nanomolar inhibition in vitro (of rabbit osteoclast-mediated degradation of bovine bone). The best compound in this series, 39n (CRA-013783/ L-006235), was orally bioavailable in rats, with a terminal half-life of over 3 h. 39n was dosed orally in ovariectomized rhesus monkeys once per day for 7 days. Collagen breakdown products were reduced by up to 76% dose-dependently. Plasma concentrations of 39n above the bone resorption IC50 after 24 h indicated a correlation between functional cellular and in vivo assays. Inhibition of collagen breakdown by cathepsin K inhibitors suggests this mechanism of action may be useful in osteoporosis and other indications involving bone resorption.