Lauroyl peroxide → rac-tert-Butyl 8-bromo-2,3-dip-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate

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To a stirred solution of tert-butyl 2,3-dip-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate (stepl) (530 mg, 1.275 mmol) in chloroform (10 ml) was added N-bromosuccinimide (272 mg, 1.531 mmol) followed by lauroyl peroxide (50.8 mg, 0.128 mmol) and the mixture was heated to reflux for 1 hour. The solvent was concentrated in vacuo. The crude product was purified by chromatography on silica eluting with 0-50% EtOAc in iso-hexane to afford the title compound which was used directly into the next step

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