1,2-Diarylpyrroles as potent and selective inhibitors of cyclooxygenase-2.
Series of 1,2-diarylpyrroles has been synthesized and found to contain very potent and selective inhibitors of the human cyclooxygenase-2 ( COX-2) enzyme. The paper describes short and practical syntheses of the target molecules utilizing the Paal-Knorr reaction. Electrophilic substitution on 1 proceeds in a regioselective fashion, and the method was used to generate a number of tetrasubstituted pyrroles. Detailed SAR on the series has been studied by modifications of the aryl rings and the substituents in the pyrrole ring. Diarylpyrrole 1 is a very potent ( COX-2, IC50 = 60 nm) and selective ( COX-1/ COX-2 = > 1700) inhibitor whereas the isomeric 2 is completely inactive against COX-2. Modifications of the substituents on the fluorophenyl ring in 1 yields very potent inhibitors of COX-2 (IC50 = 40-80 nm) with excellent selectivity (1200 to > 2500) vs COX-1. Analog 20 containing a sulfonamide group is an excellent inhibitor of COX-2 with an IC50 of 14 nm. Tetrasubstituted pyrroles containing groups such as COCF3, SO2CF3, or CH2OAr at position 3 in the pyrrole ring give excellent inhibitors ( COX-2, IC50 = 30-120 nm). In vivo testing in the carrageenan-induced paw edema model in the rat establishes that the 1,2-diarylpyrroles are orally active antiinflammatory agents. Compound 3 is the most potent inhibitor of edema with an ED50 of 4.7 mpk.[1]References
- 1,2-Diarylpyrroles as potent and selective inhibitors of cyclooxygenase-2. Khanna, I.K., Weier, R.M., Yu, Y., Collins, P.W., Miyashiro, J.M., Koboldt, C.M., Veenhuizen, A.W., Currie, J.L., Seibert, K., Isakson, P.C. J. Med. Chem. (1997) [Pubmed]
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