Cesium carbonate → 1-(4-Cyano-benzyl)-6-methyl-4-oxo-5-(3-trifluoromethyl-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid

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A mixture of 5-bromo-1-(4-cyano-benzyl)-6-methyl-4-oxo-1,4-dihydro-pyridine-3-carboxylic acid (preparation 1c, 2.55 g, 7.34 mmol), 3-(trifluoromethyl)phenylboronic acid (1.65 g, 8.69 mmol), 1,1′-[bis(diphenylphosphino)ferrocene]dichloropalladium(II) (340 mg, 0.47 mmol) and Cs2CO3 (4.20 g, 12.9 mmol) in dioxane (20.0 mL) is heated for 72 h at 80° C. The reaction mixture is filtered over silica, the filtrate is concentrated under reduced pressure and purified by preparative reversed-phase HPLC (first purification: Sunfire, gradient of methanol in water, 0.1% TFA; second purification: Xbridge, gradient of methanol in water, 0.1% NH4OH, 60° C.). Yield: 514 mg (17% of theory); ESI mass spectrum: [M+H]+=413; Retention time HPLC: 1.37 min (Z002—005).

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