反应详情

To a solution of the compound 51 (242 mg) in dimethylsulfoxide (2.0 mL)/ethyl acetate (4.0 mL) were added diisopropylethylamine (0.70 mL) and sulfur trioxide-pyridine complex (320 mg) at 10° C. and the solution was stirred for 30 minutes. Water was added to the reaction solution, which was extracted with ethyl acetate. The organic layer was washed 1N hydrochloric acid, water and brine, anhydrous sodium sulfate and concentrated. The obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=7:3) to give the title compound (154 mg) having the following physical data.

1. extractionwas extracted with ethyl acetate
2. washThe organic layer was washed 1N hydrochloric acid, water and brine, anhydrous sodium sulfate
3. concentrationconcentrated
4. customThe obtained residue was purified by column chromatography on silica gel (n-hexane:ethyl acetate=7:3)