To a solution of 2-bromo-7-(1H-indol-5-yl)-5-tosyl-5H-pyrrolo[3,2-b]pyrazine [Intermediate AV] (65 mg, 0.14 mmol) in CH3CN (1 mL) in a Personal Chemistry microwave reaction vial was added 3,4,5-trimethoxyphenylboronic acid (30 mg, 0.14 mmol), bis(triphenylphosphine)-palladium(II) dichloride (7.0 mg, 0.010 mmol), and 1 M Na2CO3 (1 mL). The resulting mixture was de-gassed with Ar for 10 min, after which it was heated at 150° C. for 10 min in a Personal Chemistry Optimizer. The organic layer was separated, filtered, and concentrated in vacuo. The residue was dissolved in MeOH (3 mL) and acetone (2 mL), and 2 M NaOH (1.5 mL) was added. The resulting mixture was stirred at 65° C. for 30 min, after which it was partitioned between EtOAc and 1 M NaOH. The organic layer was separated, dried over MgSO4, filtered, and stripped to give a residue which was purified by preparatory HPLC to give the title compound as a yellow solid. HPLC retention time: 2.25 minutes; MS ESI (m/z) 401.2 (M+1)+, calc. 400.
