反应详情

To a solution of 1-(benzhydryloxy)-2-(hydroxymethyl)-5-((4-methoxybenzyl)oxy)pyridin-4(1H)-one (Intermediate 291, 2 g, 4.51 mmol), phthalimide (0.664 g, 4.51 mmol) and triphenylphosphine (1.178 g, 4.51 mmol) in THF (20 mL) at room temperature was added diisopropyl azodicarboxylate (2.397 mL, 12.18 mmol). Reagents are insoluble. DMF (10 mL) was added. The reaction was stirred at room temperature overnight. The reaction mixture was filtered and concentrated onto silica gel. Silica gel chromatography (0%-4% methanol/dichloromethane) did not offer separation of desired product from impurities. Fractions were combined and repurified. Silica gel chromatography (0%-30% acetone/dichloromethane) afforded the title compound (1.66 g, 64.3%) as a light yellow foam.

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated onto silica gel
3. customseparation of desired product from impurities
4. customrepurified