反应详情

温度

100 °C

A solution containing 115 mg of [5-(3,5-dichlorophenylthio)-3-methyl-1-phenyl-1H-pyrazol-4-yl]-methanol, 54 mg of benzyl bromide and 38 mg of sodium hydride (60% in mineral oil) in 3 ml of anhydrous N,N-dimethylformamide was stirred under nitrogen at 100° C. for 2 hours. Water (10 ml) was added and the mixture was extracted three times with 8 ml of dichloromethane. Combined extracts were dried over magnesium sulphate, filtered and evaporated. The residue was purified twice by flash chromatography on silica gel using ethyl acetate/petroleum ether (bp 40–60° C.) (1:4) then dichloromethane for the elution to give 35 mg of 4-benzyloxymethyl-5-(3,5-dichlorophenylthio)-3-methyl-1-phenyl-1H-pyrazole as a colourless gum. Mass spectrum (ES) m/z 455 [M+H]+, 496 [M+H+CH3CN]+. 1H NMR (DMSO-dr) 2.36 (s, 3H), 4.47 (s, 2H), 4.49 (s, 2H), 6.96 (d, 2H), 7.24–7.47 (m, 11H).

1. extractionthe mixture was extracted three times with 8 ml of dichloromethane
2. dry with materialCombined extracts were dried over magnesium sulphate
3. filtrationfiltered
4. customevaporated
5. customThe residue was purified twice by flash chromatography on silica gel
6. washdichloromethane for the elution