反应详情

NH2OTHP (0.38 g, 3.21 mmol) was added to a solution of trans-3-indoleacrylic acid (17) (0.50 g, 2.67 mmol), PyBOP (1.47 g, 2.83 mmol), triethylamine (0.74 ml, 6.41 mmol) in THF (25 mL). The mixture was stirred at room temperature for 2 h and then was concentrated under reduced pressure. The residue was dissolved in EtOAc and quenched with water, followed by extraction with EtOAc (20 mL×3). The combined organic layer was dried over anhydrous MgSO4 and concentrated under reduced pressure. The residue was purified by silica gel chromatography (EtOAc:n-hexane=1.5:1:1% NH3(aq)) to afford 18. 1H NMR (500 MHz, CD3OD): δ 1.58-1.70 (m, 3H), 1.79-1.90 (m, 3H), 3.63-3.65 (m, 1H), 4.03-4.08 (m, 1H), 4.97-4.98 (m, 1H), 6.47 (d, J=14.9 Hz, 1H), 7.15-7.21 (m, 2H), 7.41 (d, J=7.8 Hz, 1H), 7.59 (s, 1H), 7.84-7.87 (m, 2H).

1. concentrationwas concentrated under reduced pressure
2. dissolutionThe residue was dissolved in EtOAc
3. customquenched with water
4. extractionfollowed by extraction with EtOAc (20 mL×3)
5. dry with materialThe combined organic layer was dried over anhydrous MgSO4
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel chromatography (EtOAc:n-hexane=1.5:1:1% NH3(aq))