反应详情

温度

90 °C

To a sealed tube was added 4-oxo-3,4-dihydroquinazoline-6-carboxylic acid (0.88 g, 4.6 mmol), methanol (70 mL) and 4.0 M hydrochloric acid in 1,4-dioxane (4.63 mL, 18.5 mmol). The reaction mixture was heated to 90° C. and stirred overnight. The mixture was then cooled to rt, and concentrated to yield methyl 4-oxo-3,4-dihydroquinazoline-6-carboxylate (0.94 g, quant). LC-MS: (FA) ES+ 205; 1H NMR (400 MHz, DMSO) δ 8.65 (d, J=2.1 Hz, 1H), 8.30 (dd, J=8.5, 2.1 Hz, 1H), 8.22 (s, 1H), 7.77 (d, J=8.5 Hz, 1H), 3.88 (s, 3H).

1. temperatureThe mixture was then cooled to rt
2. concentrationconcentrated