反应详情

Sodium hydride (1.44 g of a 60% suspension in mineral oil, 36 mmol) was added in portions over 20 minutes to a solution of 7-benzyloxy-6-methoxy-3,4-dihydroquinazolin-4-one (8.46 g, 30 mmol), (prepared as described for the starting material in Example 1), in DMF (70 ml) and the mixture was stirred for 1.5 hours. Chloromethyl pivalate (5.65 g, 37.5 mmol) was added dropwise and the mixture stirred for 2 hours at ambient temperature. The mixture was diluted with ethyl acetate (100 ml) and poured onto ice/water (400 ml) and 2M hydrochloric acid (4 ml). The organic layer was separated and the aqueous layer extracted with ethyl acetate, the combined extracts were washed with brine, dried (MgSO4) and the solvent removed by evaporation. The residue was triturated with a mixture of ether and petroleum ether, the solid was collected by filtration and dried under vacuum to give 7-benzyloxy-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (10 g, 84%).

1. custom(prepared
2. stirringthe mixture stirred for 2 hours at ambient temperature
3. customThe organic layer was separated
4. extractionthe aqueous layer extracted with ethyl acetate
5. washthe combined extracts were washed with brine
6. dry with materialdried (MgSO4)
7. customthe solvent removed by evaporation
8. customThe residue was triturated with a mixture of ether and petroleum ether
9. filtrationthe solid was collected by filtration
10. customdried under vacuum