反应详情

To a solution of methyl 5-fluoro-2-hydroxybenzoate (1.0 g, 5.88 mmol), (R)-(−)-pent-4-en-2-ol (1.210 ml, 11.76 mmol) and triphenylphosphine (2.004 g, 7.64 mmol) in THF (14 ml) was added dropwise DIAD (1.486 ml, 7.64 mmol) and the resulting solution was stirred at rt. After 20 h, the reaction was diluted with Et2O and washed with 1N NaOH, water (3×'s) and brine. The organic phase was dried (Na2SO4), filtered and concentrated. The residue was purified by flash chromatography (Biotage; 0%-40% EtOAc/hexane; 20 CV) to give methyl 5-fluoro-2-(pent-4-en-2-yloxy)benzoate (1.1331 g, 4.76 mmol, 81% yield) as a yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.49 (dd, J=8.7, 3.3 Hz, 1H), 7.15 (ddd, J=8.9, 7.7, 3.4 Hz, 1H), 6.96 (dd, J=9.0, 4.2 Hz, 1H), 6.02-5.79 (m, 1H), 5.20-5.06 (m, 2H), 4.50-4.34 (m, 1H), 3.90 (s, 3H), 2.60-2.32 (m, 2H), 1.34 (d, J=6.1 Hz, 3H).

1. washwashed with 1N NaOH, water (3×'s) and brine
2. dry with materialThe organic phase was dried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. customThe residue was purified by flash chromatography (Biotage; 0%-40% EtOAc/hexane; 20 CV)