反应详情

(4-Nitrobenzyl)hydroxylamine hydrochloride (119 mg, 0.58 mmol) and pyridine (0.5 mL, 6.45 mmol) were added to a magnetically stirred solution of 6,7-dimethoxy-1-tetralone (100 mg, 0.48 mmol) in ethanol (2 mL) and the ensuing mixture heated at reflux for 2 h. The cooled reaction mixture was concentrated under reduced pressure and the residue thus obtained partitioned between CH2Cl2 (5 mL) and water (5 mL). The separated aqueous layer was washed with CH2Cl2 (1×5 mL) and the combined organic extracts were then dried (MgSO4), filtered and concentrated under reduced pressure. The ensuing residue was subjected to flash chromatography (3:7 v/v ethyl acetate/hexane elution) and concentration of the appropriate fractions gave the title compound (148 mg, 86%) as yellow crystals, m.p. 124-127° C., Rf 0.3.

1. temperaturethe ensuing mixture heated
2. temperatureat reflux for 2 h
3. customThe cooled reaction mixture
4. concentrationwas concentrated under reduced pressure
5. customthe residue thus obtained
6. custompartitioned between CH2Cl2 (5 mL) and water (5 mL)
7. washThe separated aqueous layer was washed with CH2Cl2 (1×5 mL)
8. dry with materialthe combined organic extracts were then dried (MgSO4)
9. filtrationfiltered
10. concentrationconcentrated under reduced pressure
11. washThe ensuing residue was subjected to flash chromatography (3:7 v/v ethyl acetate/hexane elution) and concentration of the appropriate fractions