反应详情

Tetra-n-butylammonium fluoride (561 mg) was added to the mixture of the product from step (iii) in THF (14 mL). After the mixture was stirred at RT for 1.5 h, the reaction mixture was diluted with water and sat. sodium hydrogen carbonate and extracted with EtOAc. The combined organic layer was washed with brine, dried and concentrated under reduced pressure. The residue was purified by flash column chromatography on amino silica gel to afford the sub-title compound (660 mg) as a colourless oil; 1H NMR (CDCl3); 6.82 (1H, d), 6.45 (1H, d), 6.39 (1H, dd), 4.71 (2H, br s), 4.23-4.13 (1H, m), 4.07 (2H, t), 3.85 (3H, s), 3.85-3.74 (4H, m), 3.58 (2H, s), 2.33 (3H, s), 2.15 (1H, br s), 2.04-1.97 (2H, m), 1.97 (3H, s), 1.88-1.75 (1H, m), 1.60-1.47 (1H, m), 1.45-1.32 (1H, m), 1.31-1.19 (1H, m), 1.17-1.03 (2H, m), 0.79 (3H, t); LC-MS: m/z 461.

1. extractionextracted with EtOAc
2. washThe combined organic layer was washed with brine
3. customdried
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by flash column chromatography on amino silica gel