反应详情

温度

110 °C

Commercially available 7-hydroxythieno[3,2-b]pyridine (9.9 g, 65.5 mmol) was dissolved in propionic acid (200 mL) and heated to 110° C., behind a bomb shield. 4.85 mL of fuming nitric acid (90%) was added over 2 minutes, during which time a copius precipitate formed. The thick suspension was brought to reflux (oil bath temperature ˜150° C.) for 1 h during which time an orange gas evolved (Caution: procedure should only be performed in a well ventilated hood). The reaction mixture was allowed to cool to room temperature and 200 mL of diethyl ether was added. The product was collected by filtration, washed with ˜400 mL of water, 300 mL of 1:1 diethyl ether/methanol, and dried to yield 9.5 g, (74%) of A2.1 as a tan powder. M.S. 197 (M+H)+ 100%.

1. customformed
2. temperatureto reflux (oil bath temperature ˜150° C.) for 1 h during which time an orange gas
3. temperatureto cool to room temperature
4. filtrationThe product was collected by filtration
5. washwashed with ˜400 mL of water, 300 mL of 1:1 diethyl ether/methanol
6. customdried
7. customto yield 9.5 g, (74%) of A2.1 as a tan powder