反应详情

温度

65 °C

A solution of the obtained crude product of N-(2-benzyl-8-hydroxybenzo[f]quinoxalin-3-yl)acetamide (13) in methanol (20 mL) was heated to 65° C. and stirred overnight (14 hours). After cooling to room temperature, the solution was concentrated under reduced pressure and the residue was purified by silica gel flash column chromatography (n-hexane/ethyl acetate=1/1→1/10) to give 3-amino-2-benzylbenzo[f]quinoxalin-8-ol (14, v-coelenteramine) (51.3 mg, 170 mmol, quant., two steps) as an ocherous solid. TLC Rf=0.34 (n-hexane/ethyl acetate=1/1); 1H NMR (500 MHz, CD3OD) δ 4.33 (s, 2H), 7.16-7.20 (m, 2H), 7.21-7.26 (m, 1H), 7.30-7.38 (m, 5H), 7.50 (d, 1H, J=9.0 Hz), 7.76 (d, 1H, J=9.0 Hz), 8.77 (d, 1H, J=9.0 Hz).

1. temperatureAfter cooling to room temperature
2. concentrationthe solution was concentrated under reduced pressure
3. customthe residue was purified by silica gel flash column chromatography (n-hexane/ethyl acetate=1/1→1/10)