96 mg N-(2-amino-iodo-pyridin-3-yl)-3-(6-amino-4-methyl-pyridin-2-yl)-propionamide (compound A10) is dissolved in 3.0 ml anoxic dioxane under a nitrogen atmosphere. Subsequently, 0.7 ml of an aqueous sodium bicarbonate solution (2.0 M), 52 mg 4-(trifluoromethyl)phenyl-boronic acid, and 14 mg trans-dichloro-bis(tricyclohexylphosphane)palladium-(II) are added. The reaction mixture is refluxed at 110° C. for 20 h. Thereafter, the volatile components are removed in vacuo and the remaining residue is re-dissolved in a mixture of water/dichloromethane (1:1). The aqueous phase is extracted several times with dichloromethane. The organic layer is separated, dried using sodium sulfate, and evaporated to dryness to yield 161 mg of a colourless, crude solid. Subsequently, the residue is purified by flash chromatography on silica gel (eluent: dichloromethane/ethanol 8:1) to afford 52 mg of the title compound. M.p. 170° C. ESI-MS: 398.3 (MH+). TLC: Rf=0.25 (dichloromethane/methanol 8:1).
