反应详情

Sodium hydride (60% in mineral oil; 1.66 g [0.993 g NaH], 1.4 mmol, 1.10 equiv) was added to a solution of diethyl-2-cyano-4-fluorobenzyl phosphonate (10.2 g-equiv, 37.6 mmol, 1.0 equiv) in DMF (40 mL) over a period of 2 min. The reaction was stirred for 20 min at room temperature. 4-Fluorobenzaldehyde (4.67 g, 38 mmol, 1.0 equiv) was then added over a period of 2 min. After stirring for 18 h, H2O (200 mL) and satd. NaCl (50 mL) were added and the resulting mixture was extracted with EtOAc (2×100 mL). The combined organic layers were washed with 1N NaOH (1×100 mL) and H2O (2×100 mL), dried (anhyd. Na2SO4), and rotary evaporated (>100° C., heat gun). The crude, dark-red crystalline/oil (7.49 g, 82.7%) was chromatographed twice on silica gel (50×250 mm, dry pack), eluting first with hexane/EtOAc [4:1] and the second chromatography with [30:1] to provide a TLC-pure, yellow compound (2.1 g, 23.2%).

1. stirringAfter stirring for 18 h
2. extractionthe resulting mixture was extracted with EtOAc (2×100 mL)
3. washThe combined organic layers were washed with 1N NaOH (1×100 mL) and H2O (2×100 mL)
4. dry with materialdried (anhyd. Na2SO4)
5. customrotary evaporated
6. temperature(>100° C., heat gun)
7. customThe crude, dark-red crystalline/oil (7.49 g, 82.7%) was chromatographed twice on silica gel (50×250 mm, dry pack)
8. washeluting first with hexane/EtOAc [4:1]