反应详情

温度

0 °C

A solution of 12b (400 mg, 1.02 mmole) was dissolved in absolute ethanol (13 mL) and stirred at 0° C. for 10 minutes. A 4N HCl solution (22 mL) was added to the reaction mixture dropwise and stirred at 0° C. for 20 minutes and then at room temperature overnight. The solution was concentrated in vacuo to give 12c as a yellow solid in 90% yield. 1H NMR (D2O) δ 8.42 (s, 1H), 8.0 (m, 4H), 7.71 (m, 2H), 7.61 (m, 2H), 4.87 (s, 2H), 3.34 (br q, 2H), 3.14 (br t, 2H), 2.81 (t, 2H), 2.00 (q, 2H), 1.40 (t, 3H); 13C NMR (D2O): δ 133.8, 133.3 (3C), 132.4 (2C), 130.7 (2C), 128.2 (2C), 125.1 (2C), 121.5 (2C), 52.0, 51.9, 39.2 (2C), 24.5, 11.3. HRMS (FAB) calcd for C20H24N2.2HCl (M+H−2HCl)+ 293.2012, Found 293.2009.

1. stirringstirred at 0° C. for 20 minutes
2. customat room temperature
3. customovernight
4. concentrationThe solution was concentrated in vacuo