Tetrahydrofuran → HCID 86644689, Verbindung

To a solution of N-[4-chloro-5-(2-cyano-4-nitrophenoxy)-2-fluorophenyl]-2,2,2-trifluoroacetamide (16.0 g, 39.6 mmol) in acetic acid (850 ml)/tetrahydrofuran (500 mL) was added reduced iron (11.1 g, 198 mmol), and the mixture was stirred at 60° C. for 2 hr. The reaction mixture was cooled to room temperature, insoluble material was filtered off through a pad of celite, and washed with acetic acid. The filtrate and washings were combined and the mixture was concentrated under reduced pressure. The obtained residue was diluted with ethyl acetate (900 mL)/tetrahydrofuran (100 mL), washed successively with saturated aqueous sodium hydrogen carbonate solution (500 mL) and saturated brine (500 mL), and dried over anhydrous sodium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=10/90→50/50), and the obtained solution was concentrated under reduced pressure to give the title compound (12.2 g, 82%) as a white powder.