N4-(3-bromophenyl)-4,6,7-Quinazolinetriamine → N-(3-bromophenyl)pyrazino[2,3-g]quinazolin-4-amine

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Reaction Steps

A mixture of 4-(3-bromoanilino)-6,7-diaminoquinazoline (90 mg, 0.27 mmol) and 1,4-dioxane-2,3-diol (0.2 g, 1.6 mmol) [Venuti, M. C.; Synthesis, 1982, 61-63] in MeOH (20 mL) is stirred at room temperature overnight to give a precipitate of 4-(3-bromoanilino)pyrazino[2,3-g]quinazoline (80 mg, 83%). 1H NMR (DMSO) δ10.45 (1H, brs), 9.52 (1H, s), 9.09 (1H, d, J=1.6 Hz), 9.06 (1H, d, J=1.6 Hz), 8.71 (1H, s), 8.44 (1H, s), 8.32 (1H, brs), 7.99 (1H, m), 7.45-7.34 (2H, m). ##STR24##

Provenance & Evidence