4-(Trifluoromethyl)aniline → 4-N-[4-(trifluoromethyl)phenyl]pyrido[4,3-d]pyrimidine-4,7-diamine

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Reaction Conditions

Reaction Steps

A mixture of 7-amino-4-methylthiopyrido[4,3-d]pyrimidine (390 mg, 2.03 mmol), 4-aminobenzotrifluoride hydrochloride (0.40 g, 2.02 mmol) and 4-aminobenzotrifluoride (1.61 g, 10.0 mmol) is stirred at 180° C. for 2 min. The resulting product is neutralized with excess NaHCO2, dissolved in MeOH/CHCl3, dried onto alumina and chromatographed over alumina (4-7% MeOH/CH2Cl2) to give 7-amino-4-(4-trifluoromethylanilino)pyrido[4,3-d]pyrimidine (390 mg, 63%) as a cream solid. Analytically pure material was obtained by further chromatography over silica gel (5% MeOH/CH2Cl2) to give pale yellow needles. 1H NMR (DMSO) δ 10.09 (1H, brs), 9.40 (1H, s), 8.48 (1H, s), 8.13 (2H, d, J=8.2 Hz), 7.74 (2H, d, J=8.7 Hz), 6.72 (2H, brs), 6.40 (1H, s).

Provenance & Evidence