反应详情

A solution of 1-{4-[5-(4-fluoro-phenyl)-4-hydroxymethyl-oxazol-2-yl]-piperidin-1-yl}-ethanone (1.0 g; 3.14 mmol) in 95% ethanol (10 ml) is treated with a solution of sodium hydroxide (2.5 g; 62.9 mmol) in water (5 ml) and the heterogeneous mixture heated at 75 C. for three hours. The ethanol is removed in a rotary evaporator and the residue is diluted with water (10 ml) and extracted with ethyl acetate (3×20 ml) and chloroform (3×20 ml). The organic phases are washed with saturated brine (10 ml), dried over sodium sulfate and concentrated to dryness. Purification by radial chromatography on silica gel using a methanol/dichloromethane gradient (5%-30%) containing 5% triethylamine afforded the product as an orange solid (0.63 g; 73%). HNMR (CD3OD): 7.34 (dd, 2H, J=8.7; 5.6 Hz), 6.80 (t, 2H, J=8.7 Hz), 4.29 (s, 2H), 2.82 (m, 2H), 2.66 (m, 1H), 2.41 (m, 2H), 1.76 (m, 2H), 1.49 (m, 2H).

1. temperaturethe heterogeneous mixture heated at 75 C
2. customThe ethanol is removed in a rotary evaporator
3. additionthe residue is diluted with water (10 ml)
4. extractionextracted with ethyl acetate (3×20 ml) and chloroform (3×20 ml)
5. washThe organic phases are washed with saturated brine (10 ml)
6. dry with materialdried over sodium sulfate
7. concentrationconcentrated to dryness
8. customPurification by radial chromatography on silica gel using a methanol/dichloromethane gradient (5%-30%)
9. additioncontaining 5% triethylamine