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1.
Bioorg Med Chem Lett ; 23(4): 1120-6, 2013 Feb 15.
Article in English | MEDLINE | ID: mdl-23298810

ABSTRACT

Microsomal prostaglandin E(2) synthase-1 (mPGES-1) is a novel therapeutic target for the treatment of inflammation and pain. In the preceding letter, we detailed the discovery of clinical candidate PF-04693627, a potent mPGES-1 inhibitor possessing a novel benzoxazole structure. While PF-04693627 was undergoing further preclinical profiling, we sought to identify a back-up mPGES-1 inhibitor that differentiated itself from PF-04693627. The design, synthesis, mPGES-1 activity and in vivo PK of a novel set of substituted benzoxazoles are described herein. Also described is a conformation-based hypothesis for mPGES-1 activity based on the preferred conformation of the cyclohexane ring within this class of inhibitors.


Subject(s)
Benzoxazoles/chemistry , Benzoxazoles/pharmacology , Enzyme Inhibitors/chemistry , Enzyme Inhibitors/pharmacology , Intramolecular Oxidoreductases/antagonists & inhibitors , Benzoxazoles/chemical synthesis , Drug Design , Enzyme Inhibitors/chemical synthesis , Humans , Intramolecular Oxidoreductases/chemistry , Intramolecular Oxidoreductases/metabolism , Models, Molecular , Molecular Conformation , Prostaglandin-E Synthases , Structure-Activity Relationship
2.
Bioorg Med Chem Lett ; 23(4): 1114-9, 2013 Feb 15.
Article in English | MEDLINE | ID: mdl-23260349

ABSTRACT

Inhibition of mPGES-1, the terminal enzyme in the arachidonic acid/COX pathway to regulate the production of pro-inflammatory prostaglandin PGE2, is considered an attractive new therapeutic target for safe and effective anti-inflammatory drugs. The discovery of a novel series of orally active, selective benzoxazole piperidinecarboxamides as mPGES-1 inhibitors is described. Structure-activity optimization of lead 5 with cyclohexyl carbinols resulted in compound 12, which showed excellent in vitro potency and selectivity against COX-2, and reasonable pharmacokinetic properties. Further SAR studies of the benzoxazole ring substituents lead to a novel series of highly potent compounds with improved PK profile, including 23, 26, and 29, which were effective in a carrageenan-stimulated guinea pig air pouch model of inflammation. Based on its excellent in vitro and in vivo pharmacological, pharmacokinetic and safety profile and ease of synthesis, compound 26 (PF-4693627) was advanced to clinical studies.


Subject(s)
Anti-Inflammatory Agents/chemistry , Anti-Inflammatory Agents/pharmacology , Enzyme Inhibitors/chemistry , Enzyme Inhibitors/pharmacology , Inflammation/drug therapy , Intramolecular Oxidoreductases/antagonists & inhibitors , Drug Discovery , Humans , Inflammation/enzymology , Intramolecular Oxidoreductases/metabolism , Prostaglandin-E Synthases , Structure-Activity Relationship
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