反应详情

To a solution of solketal 58 (34.4 g, 260 mmol) in THF (150 mL) was added NaH (10.4 g, 260 mmol) at room temperature and the mixture stirred for 1 h. 2-chloro-4-aminopyrimidine 97 (15.0 g, 115 mmol) was then added, and the mixture was stirred at 70° C. for 48 h. The reaction mixture was concentrated and the crude residue was purified by flash chromatography (dichloromethane:methanol=15:1-10:1) to give 98 (18.2 g, 70% yield) as an oil. The acetonide protecting group could be removed after coupling with the appropriate aniline by treatment with EtOH/3 N HCl (4:1) at reflux for 12 h.

1. stirringthe mixture was stirred at 70° C. for 48 h
2. concentrationThe reaction mixture was concentrated
3. customthe crude residue was purified by flash chromatography (dichloromethane:methanol=15:1-10:1)