反应详情

To a solution of methyl-(2-phenoxyphenyl)-2-oxoacetate (0.70 g) in methanol (10 ml), 28% aqueous ammonium hydroxide (2.0 ml) was added, and the resultant mixture was stirred overnight, followed by removal of the solvent under reduced pressure. The residue was combined with diethyl ether (150 ml) and water (50 ml) under stirring and, upon dissolution, allowed to stand. The organic layer was separated, washed and dried over anhydrous sodium sulfate. Upon filtration, the filtrate was concentrated under reduced pressure to give residual yellow crystals, which were combined with methanol (10 ml) and O-methylhydroxylamine hydrochloride (1.49 g) while stirring and refluxed for 6 hours. Water (50 ml) was added to the reaction mixture, which was extracted with diethyl ether. The organic layer was washed with water and dried over anhydrous sodium sulfate, followed by filtration. The filtrate was concentrated under reduced pressure to give oily residue. The residue was purified by silica gel column chromatography with benzene to give 0.36 g of the objective compound. nD23.3 1.5978.

1. customfollowed by removal of the solvent under reduced pressure
2. customThe organic layer was separated
3. washwashed
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationUpon filtration
6. concentrationthe filtrate was concentrated under reduced pressure
7. customto give residual yellow crystals, which
8. stirringwhile stirring
9. temperaturerefluxed for 6 hours
10. extractionwas extracted with diethyl ether
11. washThe organic layer was washed with water
12. dry with materialdried over anhydrous sodium sulfate
13. filtrationfollowed by filtration
14. concentrationThe filtrate was concentrated under reduced pressure
15. customto give oily residue
16. customThe residue was purified by silica gel column chromatography with benzene