反应详情

The compound (625.7 mg) obtained in Example 115-1 was dissolved in methanol (25.0 ml) and added with a 36% formaldehyde aqueous solution (0.246 ml) and sodium cyanoborohydride (220.9 mg). The solution was adjusted to pH 5 with acetic acid and stirred at room temperature for 27 hours. The reaction solution was concentrated under reduced pressure and the residue was added with a 1 mol/l sodium hydroxide aqueous solution, followed by separation/extraction with chloroform. After having been washed with saturated saline solution, the extract was dried with anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified through silica gel column chromatography (chloroform/ethyl acetate), thereby obtaining the subject compound (648.1 mg) as a colorless oily substance.

1. concentrationThe reaction solution was concentrated under reduced pressure
2. additionthe residue was added with a 1 mol/l sodium hydroxide aqueous solution
3. extractionfollowed by separation/extraction with chloroform
4. washAfter having been washed with saturated saline solution
5. dry with materialthe extract was dried with anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified through silica gel column chromatography (chloroform/ethyl acetate)