反应详情

5-{3-[(1S)-2-Methoxy-1-methylethoxy]-5-[(triisopropylsilyl)oxy]phenyl}-1H-pyrrole-2-carboxylic acid (51.4 g, 115 mmol) synthesized in Example (106c) was dissolved in methanol (600 mL), and (R)-(−)-1-amino-2-propanol (19.9 mL, 253 mmol) and 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride n hydrate (63.7 g, 230 mmol) were added, followed by stirring for 15 hours under nitrogen atmosphere. The solvent was distilled off under reduced pressure, and water (500 mL) was added, followed by extraction twice with ethyl acetate (500 mL). Subsequently, the organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified using silica gel column chromatography (elution solvent: ethyl acetate/hexane=25%-67%) to afford the desired compound (48.7 g, yield 84%) as a white solid.

1. distillationThe solvent was distilled off under reduced pressure, and water (500 mL)
2. additionwas added
3. extractionfollowed by extraction twice with ethyl acetate (500 mL)
4. washSubsequently, the organic layer was washed with saturated brine
5. dry with materialdried over anhydrous magnesium sulfate
6. distillationThe solvent was distilled off under reduced pressure
7. customthe resulting residue was purified
8. washsilica gel column chromatography (elution solvent: ethyl acetate/hexane=25%-67%)