反应详情

A solution of ethyl (2E)-3-(7-cyano-4-fluoro-1H-indol-3-yl)-2-propenoate (D43) (10.0 g) in THF (100 mL) under H2 (30 psi) atmosphere was hydrogenated by using the catalyst of Pd/C (with 50% water, 3.0 g). The reaction was stirred for about 6 hours. TLC showed the starting material was completely consumed. Then Pd/C was removed by filtration. The filtrate was concentrated. The residue was purified by column chromatography on silical gel to afford ethyl 3-(7-cyano-4-fluoro-1H-indol-3-yl)propanoate (D44) (6.0 g) as a white solid. δH (CDCl3, 400 MHz): 1.25 (3H, t), 2.72 (2H, t), 3.18 (2H, t), 4.14 (2H, q), 6.82 (1H, t), 7.10 (1H, s), 7.45 (1H, q), 8.88 (1H, s). MS (ES): C14H13FN2O2 requires 260; found 261.1 (M+H+).

1. customwas completely consumed
2. customThen Pd/C was removed by filtration
3. concentrationThe filtrate was concentrated
4. customThe residue was purified by column chromatography on silical gel