反应详情

N,N-Dimethylformamide (3 ml) and potassium carbonate (0.33 g, 2.4 mmol) were added to 2-(2,5-dimethylphenoxymethyl)phenyl 1H-tetrazol-5-yl ketone O-methyloxime (0.40 g, 1.2 -mmol), and the mixture was stirred at room temperature for 5 minutes. Then, dimethyl sulfate (0.23 g, 1.8 mmol) was added under ice-cooling, and the mixture was stirred at room temperature overnight. After completion of the reaction, ether (150 ml) was added, and the mixture was washed with brine (50 ml) twice. The ether layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography (ethyl acetatein-hexane) and recrystallized from ethyl acetate/n-hexane to give 2-(2,5-dimethylphenoxymethyl)phenyl 1-methyl-1H-tetrazol-5-yl ketone O-methyloxime as colorless crystals (0.16 g, 37.9%) [mp. 115.5-116.5° C.; 1H-NMR(CDCl3) δ ppm: 1.97(3H,s), 2.26(3H,s), 4.06(3H,s), 4.13(3H,s), 4.89(2H,s), 6.50(1H,s), 6.65(1H,d,J=7.9), 6.97(1H,d,J=7.9), 7.34-7.58(4H,m)] and 2-(2,5-dimethylphenoxymethyl)phenyl 2-methyl-2H-tetrazol-5-yl ketone O-methyloxime as colorless crystals (0.08 g, 19.0%) [mp. 131-132° C.; 1H-NMR(CDCl3) δ ppm: 2.12(3H,s), 2.24(3H,s), 4.09(3H,s), 4.34(3H,s), 4.96(2H,s), 6.54(1H,s), 6.64(1H,d,J=7.9), 6.98(1H,d,J=7.3), 7.29-7.53(3H,m), 7.69(1H,d,J=7.3)].

1. temperaturecooling
2. stirringthe mixture was stirred at room temperature overnight
3. additionwas added
4. washthe mixture was washed with brine (50 ml) twice
5. dry with materialThe ether layer was dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel chromatography (ethyl acetatein-hexane)
8. customrecrystallized from ethyl acetate/n-hexane