Triphenylphosphine → 7-(2-(Imidazol-1-yl)ethoxy)-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

Diethyl azodicarboxylate (435 mg, 2.5 mmol) was added dropwise to a suspension of 7-hydroxy-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (612 mg, 2 mmol), (prepared as described for the starting material in Example 85), 2-(imidazol-1-yl)ethanol (280 mg, 2.5 mmol), (J. Med. Chem. 1993, 25 4052-4060), and triphenylphosphine (655 mg, 2.5 mmol) in methylene chloride (10 ml) at 5° C. The mixture was stirred for 10 minutes at 5° C. and then 1 hour at ambient temperature. The mixture was poured directly on to a silica column and eluted with methylene chloride/methanol (95/5) to give 7-(2-(imidazol-1-yl)ethoxy)-6-methoxy-3-((pivaloyloxy)methyl)-3,4-dihydroquinazolin-4-one (640 mg, 80%).

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