6-Methylanthranilic acid → 5-Methyl-4-quinazolone

Participants

Reaction Steps

6-Methylanthranilic acid (5 g, 33 mmol) and formamidine acetate (0.4 g, 41 mmol) were refluxed in 2-ethyoxyethanol (50 ml) for 16 h. On cooling the solvent was removed in vacuo, the residue slurried in diethyl ether, the solid filtered, washed with diethyl ether and dried to yield 3.6 g of the title compound. δH (DMSO d6), 7.97 (1H, s), 7.60 (1H, dd, J 7.9, 7.6 Hz), 7.43 (1H, d, J 8.0 Hz), 7.21 (1H, d, J 7.3 Hz), 2.76 (3H, s); m/z (ES+70V)161 (MH+).

Provenance & Evidence