N-bromobutanimide → 7-bromo-2-[2-(3,5-dimethoxyphenyl)ethyl]-6-[4-(4-methylpiperazin-1-yl)phenyl]-5H-pyrrolo[2,3-b]pyrazine

Participants

Reaction Steps

To a stirred solution of 2-[2-(3,5-dimethoxyphenyl)ethyl]-6-[4-(4-methylpiperazin-1-yl)phenyl]-5H-pyrrolo[2,3-b]pyrazine (from Example 1, Step 5, 120 mg, 0.262 mmol) in methylene chloride (2 mL), a solution of N-bromosuccinimide (46.7 mg, 0.262 mmol) in methylene chloride (1 mL) was added dropwise at 0° C. After 30 minutes, the reaction was quenched with saturated aqueous NaHCO3, then extracted with methylene chloride. The combined organic layers were dried over MgSO4, and then concentrated. The residue was purified on silica gel (eluting with 0 to 10% MeOH in dichloromethane (DCM)) to give the desired product (110 mg, 78%). LCMS calculated for C27H31BrN5O2 (M+H)+: m/z=536.2. Found: 536.2.

Provenance & Evidence