反应详情

温度

50 °C

According to the procedure described in Example 6A Step 2, to a solution of ethyl 2,3-dihydrobenzo[b][1,4]dioxine-6-carboxylate (1.42 g, 6.8 mmol) and Ac2O (3 mL), in AcOH (15 mL) was dropped fuming nitric acid (1 mL). The reacted ion was heated at 50° C. for 2 hours, to afford ethyl 7-nitro-2,3-dihydrobenzo[b][1,4]dioxine-6-carboxylate as a solid (1.720 g, 99%). 1H NMR (300 MHz, CDCl3) δ 7.51 (s, 1H), 7.18 (s, 1H), 4.36 (m, 6H), 1.33 (t, 3H).