反应详情

A solution of the compound (1.00 g) obtained in Example 31, dimethylformamide (25 ml) and triethylamine (1.0 ml, 7.2 mmol) was cooled to 0° C. and benzoyl chloride (0.70 ml) was gradually added dropwise thereto. The mixture was stirred at 0° C.-room temperature for 4.5 hours and the reaction mixture was poured into water and extracted with ethyl acetate. The extract was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was distilled away under reduced pressure. After the concentration, silica gel column chromatography (chloroform-methanol) and recrystallization from chloroform-methanol gave 350 mg of pale-yellow crystals (yield 27%).

1. extractionextracted with ethyl acetate
2. washThe extract was washed with saturated brine
3. dry with materialdried over anhydrous magnesium sulfate
4. distillationThe solvent was distilled away under reduced pressure
5. concentrationAfter the concentration, silica gel column chromatography (chloroform-methanol) and recrystallization from chloroform-methanol