反应详情

温度

120 °C

Potassium fluoride (225 mg) was added into a solution of 2-phenylchroman-6-ol (300 mg) in dry DMF (3 ml). After stirring the resulting mixture at 120° C. for 30 minutes 2-chloro-5-nitropyridine (195 mg) was added. The reaction mixture was stirred for a further 6½ hours at 120° C. After cooling into room temperature 1 M HCl-solution was added and the mixture was extracted with ethyl acetate. The combined organic layers were washed with water then with saturated NaCl-solution and dried with Na2SO4. 5-Nitro-2-(2-phenylchroman-6-yloxy)pyridine was recrystallised from acetone-2-propanol (1:5). 1H NMR (400 MHz, d6-DMSO) δ: 9.00 (d, 1H, J 2.9 Hz), 8.60 (dd, 1H, J 9.2, 2.9 Hz), 7.47-7.32 (m, 5H), 7.20 (d, 1H, J 9.2 Hz), 7.00-6.89 (m, 3H), 5.15 (dd, 1H, J 10.1, 2.2 Hz), 2.99 (ddd, 1H, J −16.8, 11.3, 6.2 Hz), 2.75 (ddd, 1H, J −16.8, 5.4, 3.3 Hz), 2.18 (m, 1H), 2.02 (m, 1H).

1. additionwas added
2. additionwas added
3. extractionthe mixture was extracted with ethyl acetate
4. washThe combined organic layers were washed with water
5. dry with materialwith saturated NaCl-solution and dried with Na2SO4
6. custom5-Nitro-2-(2-phenylchroman-6-yloxy)pyridine was recrystallised from acetone-2-propanol (1:5)