Potassium Carbonate → 1-Isopropyl-2-methyl-4-oxo-2'-trifluoromethyl-1,4-dihydro-[3,4]bipyridinyl-5-carboxylic acid 4-methanesulfonyl-benzylamide

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To a solution of 5-bromo-1-isopropyl-6-methyl-4-oxo-1,4-dihydro-pyridine-3-carboxylic acid 4-methanesulfonyl-benzylamide (preparation 5, 24 mg, 0.054 mmol), 2-(trifluoromethyl)pyridine-4-boronic acid (13 mg, 0.068 mmol), 1,1′-[bis(diphenylphosphino)ferrocene]dichloropalladium(II) (5 mg, 0.007 mmol) in acetonitrile (0.15 mL) is added 2 M aqueous K2CO3 solution (0.055 mL, 0.11 mmol). After stirring for 18 h at 75° C., the reaction mixture is filtered and purified by preparative reversed-phase HPLC (XBridge, gradient of methanol in water, 0.3% NH4OH, 60° C.). Yield: 4 mg (15% of theory); ESI mass spectrum: [M+H]+=508; Retention time HPLC: 0.88 min (Z003_001).

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