反应详情

7-(2-Dimethylaminoethyl)amino-9-(1,1-ethylenedioxy)ethyl-6,9-dihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione (60 mg) prepared in Example 13 (2) was added to a mixture of acetone (60 ml) and conc. hydrochloric acid (24 ml), and the resultant mixture was heated under reflux for 1 hour. After removal of acetone by distillation under reduced pressure, the water layer was washed with dichloromethane, adjusted to pH 8.0 with aqueous sodium hydroxide solution and extracted with dichloromethane. The extract was purified by silica gel chromatography using a mixture of chloroform and methanol (9:1) to give 7-(2-dimethylaminoethyl)amino-9-acetyl-6,9-dihydroxy-5,7,8,9,10,12-hexahydronaphthacene-5,12-dione (55 mg). M.P., 170°-172° C.

1. temperatureunder reflux for 1 hour
2. customAfter removal of acetone
3. distillationby distillation under reduced pressure
4. washthe water layer was washed with dichloromethane
5. extractionextracted with dichloromethane
6. customThe extract was purified by silica gel chromatography
7. additiona mixture of chloroform and methanol (9:1)