A suspension was prepared from 1-[2-(2-fluoro-6-nitrophenyl)vinyl]pyrrolidine (6 g, 25.42 mmol) in methanol (50 mL). To this suspension, Raney nickel (500 mg) was added and the hydrogenation reaction was carried out at atmospheric pressure at ambient temperature for 20 hours. After completion of the reaction, the reaction mixture was filtered through a diatomaceous earth pad and the filtrate was collected. The filtrate was concentrated under vacuum to afford the target product 4-fluoro-1H-indole (2.05 g, 60% yield) as a brown liquid.
![Pyrrolidine, 1-[2-(2-fluoro-6-nitrophenyl)ethenyl]-](/CAS/20210111/GIF/344790-94-9.gif)
