反应详情

5-Amino-2-(2-phenylchroman-6-yloxy)-pyridine of Example 26 (0.16 g) was dissolved in 7.5 ml of glacial acetic acid under nitrogen. Succinic anhydride (0.0563 g) was added and the solution refluxed 60 minutes and solution was cooled and evaporated to dryness. Toluene (25 ml) was added and evaporated again to dryness. Product was purified by column chromatography (CH2Cl2:i-PrOH /95:5 as the eluant. 1H-NMR (400 MHz; d6-DMSO): δ 8.03 (d, 1H, J=2.6 Hz), 7.73 (dd, 1H, J=8.7 Hz, J=2.6 Hz), 7.48-7.31 (m, 5H), 7.10 (d, 1H, J=8.7 Hz), 6.95 (d, 1H, J=2.6 Hz), 6.92 (dd, 1H, J=8.7 Hz, J=2.7 Hz), 6.88 (d, 1H, J=8.6 Hz), 5.13 (dd, 1H, J=10.2 Hz, J=2.2 Hz), 3.05-2.92 (m, 1H), 2.84-6.68 (m, 1H), 2.79 (s, 4H), 2.22-2.12 (m, 1H), 2.08-1.93 (m, 1H).

1. temperaturethe solution refluxed 60 minutes
2. temperaturesolution was cooled
3. customevaporated to dryness
4. additionToluene (25 ml) was added
5. customevaporated again to dryness
6. customProduct was purified by column chromatography (CH2Cl2