5-[3-(2-Phenyl-pyridin-4-yl)-imidazo[1,2-a]pyridin-7-yl]-1H-pyridin-2-one (Ex. 1.37) (1 eq, 0.096 mmol, 35 mg), iodoethane (1.5 eq, 0.144 mmol, 22.5 mg), sodium iodide (1.5 eq, 0.155 mmol, 21.5 mg) and cesium carbonate (2.99 eq, 0.287 mmol, 93.6 mg) are dissolved in DMF (2 ml) and heated at 60° C. for 16 h. The reaction mixture is diluted with CH2Cl2 and washed with Na2CO3. The organic phase is dried over MgSO4, filtered and evaporated to dryness. The reaction mixture is purified by flash chromatography on silica eluting with DCM/MeOH 8/2 to yield 7-(6-ethoxy-pyridin-3-yl)-3-(2-phenyl-pyridin-4-yl)-imidazo[1,2-a]pyridine as a yellow solid; [M+H]+=393 and 1-ethyl-5-[3-(2-phenyl-pyridin-4-yl)-imidazo[1,2-a]pyridin-7-yl]-1H-pyridin-2-one as a yellow solid; [M+H]+=393
