反应详情

温度

67.5 °C

(R)-(−)-Spiro[1-azabicyclo[2.2.2]octane-3,2′(3′H)-furo[2,3-b]pyridine] (3.03 g, 14 mmol) was dissolved in concentrated sulfuric acid (7 mL) at 0-5° C., fuming nitric acid (3.3 mL, 70.2 mmol) was added over 10 minutes, the mixture was stirred for 1 hour, and heated at 65-70° C. for 24 hours. Cooled, poured onto ice (200 gm), added 300 mL of water, basified to pH 10 with solid potassium carbonate, stirred for 1 hour, filtered off and dried the solid title compound (3.6 g, 13.8 mmol, 98%): electrospray MS (m/z, relative intensity) 262 ([MH]+, 100).

1. temperatureCooled
2. additionpoured onto ice (200 gm)
3. stirringstirred for 1 hour
4. filtrationfiltered off