A mixture of N-[5-bromo-3-(4-methoxy-benzylamino)-pyrazin-2-yl]-formamide (160 mg, 0.47 mmol), 4-fluoro-phenyl boronic acid (200 mg, 1.44 mmol), Pd(PPh3)2Cl2 (2 mg, 0.0028 mmol), and NaHCO3 (118 mg, 1.41 mmol) in DME (1 mL) and water (0.2 mL) was put in a microwave reaction tube and reacted in a microwave reactor at 110° C. for 7 minutes. The reaction mixture was partitioned in ethyl acetate and water, and the organic layer was evaporated. The residue was purified on a C-18 reversed phase preparative HPLC eluting with Methanol/Acetontrile containing 0.1% trifluoroacetic acid to provide 6-(4-fluoro-phenyl)-1-(4-methoxy-benzyl)-1H-imidazo[4,5-b]pyrazine as a white solid (48 mg).
