Bioisosteric replacement of anilide with benzoxazole: potent and orally bioavailable antagonists of VLA-4
作者:Linus S Lin、Thomas J Lanza、Laurie A Castonguay、Theodore Kamenecka、Ermenegilda McCauley、Gail Van Riper、Linda A Egger、Richard A Mumford、Xinchun Tong、Malcolm MacCoss、John A Schmidt、William K Hagmann
DOI:10.1016/j.bmcl.2004.01.098
日期:2004.5
We have designed and synthesized a series of heterocyclic bioisosteres for an anilide based on molecular modeling. Excellent potency was retained in the benzoxazole and the benzimidazole derivatives, where a hydrogen bond acceptor is appropriately positioned to mimic the amide bond oxygen. The deletion of the hydrogen bond donor (N-H) led to improved lipophilicity and bioavailability. In the process, 9a was identified as a potent, specific, and bioavailable VLA-4 antagonist, while 9c was found to be a potent and bioavailable dual antagonist of VLA-4 and alpha(4)beta(7). (C) 2004 Elsevier Ltd. All rights reserved.