反应详情

The compound (73 mg, 0.157 mmol) obtained in Example 1a and the compound (144 mg, 0.157 mmol) obtained in Example 1l were dissolved in methanol (2 mL), and the mixture was stirred at room temperature for 15 minutes. Toluene was added, then the solvent was evaporated under reduced pressure, sodium triacetoxyborohydride (100 mg, 0.471 mmol) was added to a solution of the resulting residue in methanol (2 mL), and the mixture was stirred at room temperature for 2.5 hours. The solvent was evaporated under reduced pressure, and the resulting residue was purified by NH silica gel column chromatography (ethyl acetate:methanol=60:1→20:1, v/v) and further purified by reverse phase preparative column chromatography (Waters; XTerra Prep MS C18 OBD, 5 μm, 30×100 mm) (acetonitrile:0.1% aqueous ammonium acetate solution=40:60→100:0, v/v) to give the title compound (57 mg; yield, 27%) as a light yellow solid.

1. stirringthe mixture was stirred at room temperature for 2.5 hours
2. customThe solvent was evaporated under reduced pressure
3. customthe resulting residue was purified by NH silica gel column chromatography (ethyl acetate:methanol=60:1→20:1, v/v)
4. customfurther purified by reverse phase preparative column chromatography (Waters; XTerra Prep MS C18 OBD, 5 μm, 30×100 mm) (acetonitrile