反应详情

Sodium hydride (60% in oil, 127 mg) was added under a nitrogen atmosphere to a solution of ethyl Z-2-hydroxyimino-2-(4-methoxyphenyl)acetate (711 mg) and 4-(4-chloromethylphenoxymethyl)-5-methyl-2-phenyloxazole (1.00 g) in N,N-dimethylformamide (10 ml) at room temperature and the mixture was stirred for 1 hour. After adding 1N HCl (5 ml), aqueous sodium bicarbonate was added, and then the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride, dried (MgSO4) and then concentrated. The residue was subjected to column chromatography on silica gel to obtain ethyl Z-2-(4-methoxyphenyl)-2-[4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzyloxyimino]acetate (1.50 g, yield: 94%) as crystals from a fraction eluted with ethyl acetate-hexane (1:2, v/v). Recrystallization was performed from ethyl acetate-hexane. m.p. 102-103° C.

1. additionwas added
2. extractionthe mixture was extracted with ethyl acetate
3. washThe ethyl acetate layer was washed with saturated aqueous sodium chloride
4. dry with materialdried (MgSO4)
5. concentrationconcentrated