反应详情

A solution of 3-(3-bromo-2-methylphenyl)-8-chloroquinazoline-2,4(1H,3H)-dione (1.45 g, 3.97 mmol) in DMF (15 mL) was treated with Cs2CO3 (3.88 g, 11.9 mmol) and iodomethane (2.48 mL, 39.7 mmol) and stirred at room temperature for 1.5 h. The mixture was diluted with water and a mixture of EtOAc and hexanes. The organic phase was washed with water, dried and concentrated. The residue was purified by column chromatography on silica gel (80 g), eluting with EtOAc-hexanes (gradient from 5-40%), to give 3-(3-bromo-2-methylphenyl)-8-chloro-1-methylquinazoline-2,4(1H,3H)-dione as a white solid (1.3 g, 81% yield). Mass spectrum m/z 379, 391 (M+H)+.

1. washThe organic phase was washed with water
2. customdried
3. concentrationconcentrated
4. customThe residue was purified by column chromatography on silica gel (80 g)
5. washeluting with EtOAc-hexanes (gradient from 5-40%)