反应详情

0.70 g of methyl N-[2-chloro-5-(1-hydroxyiminoethyl)benzyl]carbamate was dissolved in 10 ml of N,N-dimethylformamide, and 0.13 g of 60% sodium hydride was added thereto under cooling with ice, followed by stirring for 1 hour. 0.57 g of 4-fluorobenzyl bromide was dissolved in 2 ml of N,N-dimethylformamide, which was dropwise added to the reaction mixture under cooling with ice. After completion of the dropwise addition, the mixture was stirred at room temperature for 16 hours. After completion of the reaction, the reaction solution was poured into water, extraction with ethyl acetate was carried out, followed by washing with water, and the organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (Wakogel C-200, eluent: hexane/ethyl acetate=5/1) to obtain 0.75 g of methyl N-{2-chloro-5-[1-(4-fluorobenzyloxyimino)ethyl]benzyl}carbamate (m.p. 101-103° C.) as colorless crystals.

1. temperatureunder cooling with ice
2. additionwhich was dropwise added to the reaction mixture
3. temperatureunder cooling with ice
4. additionAfter completion of the dropwise addition
5. stirringthe mixture was stirred at room temperature for 16 hours
6. customAfter completion of the reaction
7. washby washing with water
8. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
9. distillationThe solvent was distilled off under reduced pressure
10. customthe residue was purified by silica gel column chromatography (Wakogel C-200, eluent: hexane/ethyl acetate=5/1)