反应详情

(±)-3-(2,4-Dihydroxyphenyl)cyclopentanone (5 mg), hydroxylamine hydrochloride (2.7 mg) and triethylamine (5.4 uM) were heated in EtOH (4 ml) under reflux for 3 hr. The reaction mixture was partitioned between ethyl acetate (20 ml) and water (20 ml). The aqueous phase was extracted with ethyl acetate (10 ml), and the combined organic phases were washed with brine (10 ml), dried over magnesium sulfate, and concentrated in vacuo. The crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 4:1 v/v) to furnish the title compound as a white solid and a mixture of isomers (3.8 mg, 71%). δH (d4-MeOH) 1.80-1.93 (1H, overlapping m), 2.05-2.20 (0.5H, m), 2.39-2.55 (3H, overlapping m), 2.68-2.74 (1H, overlapping m), 2.94 (0.5H, br dd), 6.26-6.33 (2H, overlapping m), 6.94 (0.5H, d), 6.96 (0.5H, d); m/z (ES−) 266 ((M+60)−1)−.

1. temperatureunder reflux for 3 hr
2. customThe reaction mixture was partitioned between ethyl acetate (20 ml) and water (20 ml)
3. extractionThe aqueous phase was extracted with ethyl acetate (10 ml)
4. washthe combined organic phases were washed with brine (10 ml)
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated in vacuo
7. customThe crude residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 4:1 v/v)