反应详情

温度

80 °C

N-[2-(5-Formyl-2,4-dimethoxy-phenyl ethynyl)phenyl]acetamide (Ex-57E, 535 mg, 1.6 mmol) was added to 150 mL of DMF (nitrogen purged) at room temperature and the resulting solution was heated to 80° C. Palladium(II) chloride (22 mg) was added in one portion. After 6 h the reaction mixture was poured into water (50 mL) and EtOAc (50 mL), and the layers were cut. The organic layer was filtered through Celite, washed with brine, and concentrated to an orange solid. The crude was purified by silica gel chromatography (25% ethyl acetate/hexane) to yield 210 mg (39%) of 5-(1-acetyl-1H-indol-2-yl)-2,4-dimethoxybenzaldehyde as a white solid. 1H-NMR (300 MHz, DMSO-d6) 10.22 (s, 1H), 8.13 (d, 1H, J=8.1 Hz), 7.71 (s, 1H), 7.55 (d, 1H, J=6.3 Hz), 7.25 (m, 2H, J=6.9 Hz), 6.84 (s, 1H), 6.64 (s, 1H), 4.01 (s, 3H), 3.87 (s, 3H), 2.13 (s, 3H).

1. filtrationThe organic layer was filtered through Celite
2. washwashed with brine
3. concentrationconcentrated to an orange solid
4. customThe crude was purified by silica gel chromatography (25% ethyl acetate/hexane)