反应详情

To 3-dimethylamino-5-(1-(3-benzoylphenyl)ethyl)-1,2,4-oxadiazole (1.0 g, 3.11 mmol) in ethanol (10 ml) were added hydroxylamine hydrochloride (0.25 g, 3.45 mmol) in water (2 ml) and sodium hydroxide (0.40 g, 9.5 mmol) in water (2 ml). After reflux with stirring for 24 h, the mixture was poured upon ice water and extracted with ethyl acetate. The ethyl acetate extracts were washed with saturated NaCl aq. dried with anhydrous magnesium salfate, and evaporated under redused pressure to a residue, which was chromatographed to afford 3-dimethylamino-5-(1-(3-(α-hydroxyiminobenzyl)phenyl)ethyl)-1,2,4-oxadiazole (0.873 g, 84% yield) as oily substance: NMR(CDCl3)δ1.66(d)+1.77(d) (3H), 2.98(s, 6H), 4.20(m, 1H), 7.22-7.55(m, 9H) ppm; IR(neat) 3700-3100, 1600, 1405 cm-1.

1. temperatureAfter reflux
2. extractionextracted with ethyl acetate
3. washThe ethyl acetate extracts were washed with saturated NaCl aq.
4. dry with materialdried with anhydrous magnesium salfate
5. customevaporated under redused pressure to a residue, which
6. customwas chromatographed