反应详情

To a solution of 1-{4-[5-(2-fluorobiphenyl-4-yl)-1,2,4-oxadiazol-3-yl]benzyl}-piperidine-4,4-dicarboxylic acid benzyl ester (2,2-dimethyl-propanoyl-oxymethyl) ester (0.37 g, 0.00052 mol) in a mixture of ethanol and ethyl acetate (20 mL, 1:1) is added 5% Pd/C (0.133 g). The reaction mixture is stirred at room temperature and hydrogen gas is bubbled through it. This process is continued for 2.5 hours. The reaction mixture is filtered through a celite bed, washed with tetrahydrofuran (2×30 mL) and the filtrate is concentrated under reduced pressure to give a solid mass which is purified by column chromatography (silica gel 230-400 mesh, methanol:dichloromethane 15:85) to give 1-{4-[5-(2-fluorobiphenyl-4-yl)-1,2,4-oxadiazol-3-yl]benzyl}-piperidine-4,4-dicarboxylic acid (2,2-dimethyl-propanoyloxymethyl)ester (e.g. 39).

1. customhydrogen gas is bubbled through it
2. filtrationThe reaction mixture is filtered through a celite bed
3. washwashed with tetrahydrofuran (2×30 mL)
4. concentrationthe filtrate is concentrated under reduced pressure
5. customto give a solid mass which
6. customis purified by column chromatography (silica gel 230-400 mesh, methanol:dichloromethane 15:85)