Hydrochloric Acid → (7-(Benzyloxy)-6-methoxy-4-oxoquinazolin-3(4H)-yl)methyl pivalate

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Reaction Steps

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), 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 over magnesium sulphate 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%).

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