Cesium carbonate → Amg 579

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The mixture of (1H-benzo[d]imidazol-2-yl)(4-hydroxyphenyl)methanone (0.16 g, 0.67 mmol), 1-(4-(3-fluoropyrazin-2-yl)piperidin-1-yl)ethanone (0.1 g, 0.45 mmol), and cesium carbonate (0.22 g, 0.67 mmol) in DMSO (1.5 mL) was heated at 80° C. for 20 h. After cooling to RT, the reaction mixture was partitioned between Teac and brine. The aqueous layer was back extracted with Teac (2×) and the combined organic layer was dried (Na2SO4) and concentrated. The crude material was purified by chromatography through a Redi-Sep pre-packed silica gel column (40 g), eluting with a gradient of 0% to 100% Teac in hexane, then 5% MeOH in Teac, to provide 1-(4-(3-(4-(1H-benzo[d]imidazole-2-carbonyl)phenoxy)pyrazin-2-yl)piperidin-1-yl)ethanone as off-white solid. MS (ESI, pos. ion) m/z: 442.1 (M+1). IC50 (uM) +++++.

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