A thick-walled microwave bottle equipped with a stirbar was charged with 6-bromo-1-(pentan-3-yl)-1H-imidazo[4,5-b]pyrazin-2-ol (1.0 equiv) and (Ph3P)4Pd (0.15 equiv). The bottle was covered with a sheet of Parafilm and purged with nitrogen for 5-10 min, and N-methylpyrrolidone (11.7 volume equivalents), triethyl amine (2.0 equiv), and (E)-tributyl(prop-1-enyl)stannane (2.0 equiv) were added by syringe. The resulting mixture was immediately fitted with a septum and cap and heated to 120° C. in a microwave for 20 min. The reaction was then diluted with EtOAc, washed with three times with water and once with brine. The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Reverse-phase preparative HPLC provided the title compound (15%) as a foam. LCMS m/z (APCI)=247.1 (M+H).
