反应详情

To a solution of the product (300 mg) of the above (1) in dimethylsulfoxide (5 ml) is added acetic anhydride (0.7 ml). The mixture is stirred at room temperature for 20 hours. The reaction mixture is poured into ice water, made alkaline with ammonium hydroxide and extracted with ether. The extract is washed with water, dried and evaporated to give an oil (450 mg). The oil is chromatographed on a column of silica gel and eluted with hexane-benzene (3:10) and benzene. The title compound is obtained from the latter eluate. Recrystallization from acetone-petroleum benzine gives colorless needles melting at 120.5°-122.5° C.

1. extractionextracted with ether
2. washThe extract is washed with water
3. customdried
4. customevaporated