Ethyl Bromide → 6-ethoxy-7-methoxyquinazolin-4(3H)-one

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Reaction Steps

A mixture of 6-hydroxy-7-methoxyquinazoline-4(3H)-one (1.0 g, 5.2 mmol) and Cs2CO3 (1.69 g, 5.2 mmol) in H2O:MeCN:MeOH (10:5:1, 20 mL) was stirred at room temperature for 30 minutes and to it was added bromoethane (0.567 g, 5.2 mmol). Then, it was stirred at 60° C. two days. It was filtered to afford 6-ethoxy-7-methoxyquinazolin-4(3H)-one as a solid (0.550 g, 48%). 1H NMR (300 MHz, DMSO-d6) δ 8.0 (s, 1H), 7.91 (s, 1H), 7.4 (d, 1H), 7.1 (d, 1H), 4.15 (t, 2H), 3.9 (s, 3H), 1.4 (t, 3H).

Provenance & Evidence