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3‑Substituted 1,5-Diaryl‑1H‑1,2,4-triazoles as Prospective PET Radioligands for Imaging Brain COX‑1 in Monkey. Part 1: Synthesis and Pharmacology

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journal contribution
posted on 20.04.2018 by Prachi Singh, Stal Shrestha, Michelle Y. Cortes-Salva, Kimberly J. Jenko, Sami S. Zoghbi, Cheryl L. Morse, Robert B. Innis, Victor W. Pike
Cyclooxygenase-1 (COX-1) is a key enzyme in the biosynthesis of proinflammatory thromboxanes and prostaglandins and is found in glial and neuronal cells within brain. COX-1 expression is implicated in numerous neuroinflammatory states. We aim to find a direct-acting positron emission tomography (PET) radioligand for imaging COX-1 in human brain as a potential biomarker of neuroinflammation and for serving as a tool in drug development. Seventeen 3-substituted 1,5-diaryl-1H-1,2,4-triazoles were prepared as prospective COX-1 PET radioligands. From this set, three 1,5-(4-methoxyphenyl)-1H-1,2,4-triazoles, carrying a 3-methoxy (5), 3-(1,1,1-trifluoroethoxy) (20), or 3-fluoromethoxy substituent (6), were selected for radioligand development, based mainly on their high affinities and selectivities for inhibiting human COX-1, absence of carboxyl group, moderate computed lipophilicities, and scope for radiolabeling with carbon-11 (t1/2 = 20.4 min) or fluorine-18 (t1/2 = 109.8 min). Methods were developed for producing [11C]­5, [11C]­20, and [d2-18F]6 from hydroxy precursors in a form ready for intravenous injection for prospective evaluation in monkey with PET.