Triphenylphosphine → 7-(3-Bromopropoxy)-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one

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Reaction Steps

Diethyl azodicarboxylate (3.9 ml, 24.5 mmol) was added in portions to a suspension of 7-hydroxy-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (5 g, 16.3 mmol), (prepared as described for the starting material in Example 12), 3-bromo-1-propanol (2.21 ml, 24.5 mmol) and triphenylphosphine (6.42 g, 24.5 mmol) in methylene chloride (50 ml). After stirring for 2 hours at ambient temperature, the volatiles were removed under vacuum and the residue was purified by column chromatography eluting with methylene chloride followed by methylene chloride/methanol (95/5) to give 7-(3-bromopropoxy)-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (6 g, 86%).

Provenance & Evidence