Triethylamine → 4-N-(3-bromophenyl)-7-N,7-N-dimethylpyrido[4,3-d]pyrimidine-4,7-diamine

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Reaction Conditions

Reaction Steps

A mixture of 7-fluoro-4-(3-bromoanilino)pyrido[4,3-d]pyrimidine (101 mg, 0.32 mmol), triethylamine (4.4 mL, 32 mmole) and dimethylamine hydrochloride (2.58 g, 32 mmol) in isopropanol (30 mL) contained in a steel bomb is stirred at 100° C. (oil bath) for 4 h. The resulting solution is concentrated under vacuum, basified with aqueous Na2CO3 and diluted with water to give a solid. Filtration and recrystallisation from MeOH/CHCl3 gives 7-dimethylamino-4-(3-bromoanilino)pyrido[4,3-d]pyrimidine (102 mg, 94%) as a pale yellow solid. 1H NMR (DMSO) δ 9.93 (1H, brs), 9.42 (1H, s), 8.48 (1H, s), 8.19 (1H, s), 7.85 (1H, d, J=7.7 Hz), 7.35 (1H, t, J=7.9 Hz), 7.30 (1H, brd, J=7.8 Hz), 6.53 (1H, s), 3.16 (6H, s).

Provenance & Evidence