Trityl chloride → 2-bromo-N-tert-butyl-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide

Beteiligte Stoffe

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Reaktionsschritte

A mixture of 2-bromo-N-tert-butyl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (378 mg, 1.272 mmol), (chloromethanetriyl)tribenzene (426 mg, 1.53 mmol) and triethylamine (193 mg, 1.91 mmol) in dry DMF (20 mL) was heated to 90° C. for 16 hours. Reaction mixture was extracted with ethyl acetate (100 mL), organic phase washed with water (3×10 mL) and brine (2×10 mL), then dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography (silica gel, 200-300 mesh, eluting with EtOAc: petroleum ether=1:15) to afford 2-bromo-N-tert-butyl-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (515 mg, 75%) as a white solid. 1H NMR (300 MHz, CDCl3): δ 8.29 (s, 1H), 8.01 (s, 1H), 7.29-7.26 (m, 10H), 7.13-7.11 (m, 5H), 1.51 (s, 9H). LCMS: (M+H)+=539.

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