Design and Synthesis of a Series of (2R)-N⁴-Hydroxy-2-(3-hydroxybenzyl)-N- [(1S,2R)-2-hydroxy-2,3-dihydro-1H-inden- 1-yl]butanediamide Derivatives as Potent, Selective, and Orally Bioavailable Aggrecanase Inhibitors

A pharmacophore model of the P1' site, specific for aggrecanase, was defined using the specificity studies of the matrix metalloproteinases and the similar biological activity of aggrecanase and MMP-8. Incorporation of the side chain of a tyrosine residue into compound 1 as the P1' group provided modest selectivity for aggrecanase over MMP-1, -2, and -9. A cis-(1S)(2R)-amino-2-indanol scaffold was incorporated as a tyrosine mimic (P2') to conformationally constrain 2. Further optimization resulted in compound 11, a potent, selective, and orally bioavailable inhibitor of aggrecanase.