Second-Generation Lymphocyte Function-Associated Antigen-1 Inhibitors: 1<i>H</i>-Imidazo[1,2-α]imidazol-2-one Derivatives
作者:Jiang-Ping Wu、Jonathan Emeigh、Donghong A. Gao、Daniel R. Goldberg、Daniel Kuzmich、Clara Miao、Ian Potocki、Kevin C. Qian、Ronald J. Sorcek、Deborah D. Jeanfavre、Kei Kishimoto、Elizabeth A. Mainolfi、Gerald Nabozny、Charline Peng、Patricia Reilly、Robert Rothlein、Rosemarie H. Sellati、Joseph R. Woska、Shirlynn Chen、Jocelyn A. Gunn、Drane O'Brien、Stephen H. Norris、Terence A. Kelly
DOI:10.1021/jm049657b
日期:2004.10.1
A novel class of lymphocyte function-associated antigen-1 (LFA-1) inhibitors is described. Discovered during the process to improve the physicochemical and metabolic properties of BIRT377 (1, Figure 1), a previously reported hydantoin-based LFA-1 inhibitor, these compounds are characterized by an imidazole-based 5,5-bicyclic scaffold, the 1,3,3-trisubstituted 1H-imidazo [1,2-alpha]imidazol-2-one (i.e. structure 3). The structure-activity relationship (SAR) shows that electron-withdrawing groups at C-5 on the imidazole ring benefit potency and that oxygen-containing functional groups attached to a C-5-sulfonyl or sulfonamide group further improve potency. This latter gain in potency is attributed to the interaction(s) of the functionalized sulfonyl/sulfonamide groups with the protein, likely polar-polar in nature, as suggested by SAR data. X-ray studies revealed that these bicyclic inhibitors bind to the I-domain of LFA-1 in a pattern similar to that of compound 1.