反应详情

Step AF (2): To a solution of methyltriphenylphosphonium bromide (1.6 g) in THF (5 mL) was added potassium t-butoxide (700 mg), and the mixture was stirred at rt for 30 min to form a deep yellow solution. A solution of (S)-2,2,2-trifluoro-N-(6-methoxy-3-oxo-2,3-dihydro-1H-inden-1-yl)acetamide (500 mg) in THF (2 mL) was added, and the reaction was continued for 40 min. Water was added, the aqueous layer was extracted with EtOAc (×3), and the combined organic layers were washed with brine, dried over anhydrous sodium sulfate, and filtered. The filtrate was evaporated in vacuo, and the residue was purified by Biotage chromatography eluting with 1-10% EtOAc/hexanes to give (S)-2,2,2-trifluoro-N-(6-methoxy-3-methylene-2,3-dihydro-1H-inden-1-yl)-acetamide as a white solid (460 mg). 1H NMR (400 MHz, CDCl3) δ 7.45 (1H, d), 6.91 (1H, dd), 6.83 (1H, d), 6.45 (1H, br. S), 5.38 (1H, dt), 5.38 (1H, t), 4.99 (1H, t), 3.81 (3H, s), 3.45 (1H, m), and 2.62 (1H, m).

1. customto form a deep yellow solution
2. waitthe reaction was continued for 40 min
3. extractionthe aqueous layer was extracted with EtOAc (×3)
4. washthe combined organic layers were washed with brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. customThe filtrate was evaporated in vacuo
8. customthe residue was purified by Biotage chromatography
9. washeluting with 1-10% EtOAc/hexanes