反应详情

A mixture of 4-fluorobenzaldehyde (6.0 mL, 55.93 mmol), and isobutylamine (3.72 g, 50.85 mmol) in toluene (30 mL) was heated at reflux using Dean-Stark apparatus of 5 hours. The mixture was stood at ambient temperature for 18 hours then cooled in an ice-bath. Sodium borohydride (2.89 g, 76.28 mmol) was added followed by MeOH (5 mL). After 1 hour at 0° C. the reaction was quenched with 1M HCl, basified with a saturated solution of NaHCO3 and extracted into EtOAc (3×). The combined extracts were washed with brine, dried over Na2SO4 and concentrated under vacuum. Purification by silica gel column chromatography (0-10% MeOH in DCM) afforded the title compound (6.98 g, 76%) as a colourless oil. 1H NMR (300 MHz, CDCl3) δ 7.28 (m, 2H), 7.00 (m, 2H), 3.74 (s, 2H), 2.42 (d, J=6.8 Hz, 2H), 1.76 (m, 1H), 0.91 (d, J=6.6 Hz, 6H).

1. temperaturewas heated
2. temperatureat reflux
3. customDean-Stark apparatus of 5 hours
4. temperaturethen cooled in an ice-bath
5. customAfter 1 hour at 0° C. the reaction was quenched with 1M HCl
6. extractionextracted into EtOAc (3×)
7. washThe combined extracts were washed with brine
8. dry with materialdried over Na2SO4
9. concentrationconcentrated under vacuum
10. customPurification by silica gel column chromatography (0-10% MeOH in DCM)