To a solution of 2-bromo-N-(1-methylcyclopropyl)-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (600 mg, 2.1 mmol) in 20 mL of dry THF was added Et3N (0.42 mL, 4.2 mmol) and reaction mixture stirred for 5 mins, then (chloromethanetriyl)tribenzene (540 mg, 2.53 mmol) was added and reaction mixture stirred for 10 mins. Then, the reaction was heated to 60° C. and stirring continued for 3 hrs. The reaction was quenched with brine (10 mL), product extracted with ethyl acetate (3×20 mL), organics combined dried with sodium sulfate, filtered and concentrated to give 2-bromo-N-(1-methylcyclopropyl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (400 mg, 37%) as yellow solid. 1H NMR (300 MHz, CDCl3): δ 8.32 (s, 1H), 8.01 (s, 1H), 7.31-7.26 (m, 15H), 1.51 (s, 3H), 1.25 (s, 2H), 0.90-0.74 (m, 2H). LCMS: (M+H)+=537/539.
