反应详情

3-(4-(4-t-Butoxycarbonyl-piperazin-1-yl)-3-fluorophenyl)-5(R)-hydroxymethyloxazolidin-2-one (WO 93/23384; 10 g, 25.3 mmol), 3-hydroxyisoxazole (2.58 g, 30 mmol), and triphenylphosphine (9.95 g, 37.8 mmol) were dissolved in anhydrous tetrahydrofuran (300 ml), and cooled under nitrogen to 4°. Diisopropylazodicarboxylate (6.04 g, 30 mmol) was added dropwise over 10 minutes, and stirring was continued at the same temperature for 2 hours. The mixture was evaporated to dryness, and the residue purified by flash chromatography on silica, eluting with 50% EtOAc in isohexane. Relevant fractions were combined and evaporated to give the desired product (10.2 g).

1. temperaturecooled under nitrogen to 4°
2. customThe mixture was evaporated to dryness
3. customthe residue purified by flash chromatography on silica
4. washeluting with 50% EtOAc in isohexane
5. customevaporated