Sodium borohydride → 3-{1-[6-Ethoxy-7-(2-hydroxyethyl)oxy-2-morpholino-4-quinazolinyl]-4-piperidinyl}-1,2,3,4-tetrahydro-1,6-dimethyl-2,4-dioxoquinazoline

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Reaction Steps

In 20 ml of ethanol was dissolved 2.10 g (3.32 mmol) of Compound 54 obtained in Example 54, excess sodium borohydride was added, and the mixture was stirred under heating at reflux for 1 hour. After cooling, the solvent was removed, water was added and the mixture was subjected to extraction with ethyl acetate. The organic layer was washed with sodium chloride solution, dried and concentrated to give residue. The residue was purified by silica gel column chromatography(eluent: chloroform/methanol=100/1) and recrystallized from ethanol to give 1.29 g (yield: 66%) of Compound 55 as white crystals.

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