反应详情

To a solution of 3-methoxy-5-phenyl-pyrazine-2-carboxylic acid methyl ester (150 mg, 0.58 mmol) in THF (20 mL) is added DIBAL-H (1 M in DCM, 1 mL, 1 mmol) dropwise at 0° C. under N2. The mixture is stirred at this temperature for 0.5 hour. Another portion of DIBAL-H (1 M in DCM, 0.8 mL, 0.8 mmol) is added. After 0.5 hour, the reaction is quenched with saturated NH4Cl (1 mL), and then NaOH (1.5 M, 2 mL). The mixture is extracted with EtOAc (3×20 mL). The combined organic layers are dried and the solvent removed. The crude product is purified by PTLC (silica gel; 10% MeOH in DCM) to give 60 mg of (3-methoxy-5-phenyl-pyrazin-2-yl)-methanol as an oil.

1. waitAfter 0.5 hour
2. customthe reaction is quenched with saturated NH4Cl (1 mL)
3. extractionThe mixture is extracted with EtOAc (3×20 mL)
4. customThe combined organic layers are dried
5. customthe solvent removed
6. customThe crude product is purified by PTLC (silica gel; 10% MeOH in DCM)