反应详情

To a solution of 3-(4-hydroxybenzyl)-5-phenyl-1H-pyrazolo [4,3-c][1,8]naphthyridin-4 (5H)-one (192 mg, 0.52 mmol, prepared in Example 41) in DMF (2 ml) was added a solution of 1-acetylimidazole (114 mg, 1.04 mmol, 2 eq.) in DMF (2 ml) while ice-cooling, and the mixture was stirred overnight at room temperature, and then diluted with aqueous sodium hydrogen carbonate. Precipitates were filtered off, and the mixture was dried and purified by flash column chromatography to afford 3-(4-acetoxybenzyl)-5-phenyl-1H-pyrazolo[4,3-c][1,8]naphthyridin-4 (5H)-one (128 mg, 60%).

1. temperaturecooling
2. customPrecipitates
3. filtrationwere filtered off
4. customthe mixture was dried
5. custompurified by flash column chromatography