反应详情

A portion (0.20 g) of the compound obtained in Example 41 and 2-aminoethanol (0.49 ml) were suspended in a mixed solvent of methanol (3 ml) and methylene chloride (2 ml) and to the suspension was added sodium cyanoborohydride (61 mg). The mixture was stirred for 13 hours at room temperature and heated to reflux for further 8 hours. The reaction mixture was concentrated under reduced pressure. Water was added to the residue, followed by extraction with three portions of methylene chloride. The organic layers were combined, washed with saturated aqueous solution of sodium chloride and dried over anhydrous sodium sulfate. Then, the solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (methylene chloride/methanol=19:1) and further crystallized from ether to yield 75 mg (32%) of the titled compound as yellowish brown crystals.

1. temperatureheated
2. temperatureto reflux for further 8 hours
3. concentrationThe reaction mixture was concentrated under reduced pressure
4. additionWater was added to the residue
5. extractionfollowed by extraction with three portions of methylene chloride
6. washwashed with saturated aqueous solution of sodium chloride
7. dry with materialdried over anhydrous sodium sulfate
8. distillationThen, the solvent was distilled off under reduced pressure
9. customthe residue was purified by silica gel column chromatography (methylene chloride/methanol=19:1)
10. customfurther crystallized from ether