反应详情

To a solution of 6-bromo-5-hydroxy-1H-indazole (5 g, 23.5 mmol) in THF (50 mL) is added benzyl alcohol (3.05 g, 28.2 mmol), PPh3 (7.39 g, 28.2 mmol) and diethylazodicarboxylate (4.46 mL, 28.2 mmol). After the reaction mixture is stirred at RT overnight, EtOAc (50 mL) and saturated aqueous NH4Cl (30 mL) are added. The organic phase is separated, dried over MgSO4, and concentrated. The residue is purified by silica gel column chromatography eluting with PE:EtOAc (4:1) to provide the product (5.0 g, 70.2% yield). MS (m/z): 303.0 (M+H).

1. customThe organic phase is separated
2. dry with materialdried over MgSO4
3. concentrationconcentrated
4. customThe residue is purified by silica gel column chromatography
5. washeluting with PE