5-Nitrofurfural → HCID 86623873, compound

Participants

Reaction Steps

1H-Imidazo[4,5-b]pyridine-2-thiol (1.51 g, 10.0 mmol) is suspended into 80 mL of tetrahydrofuran under argon. Then, 0.72 g (15.0 mmol) of sodium hydride is added. The reaction mixture is stirred at room temperature until gas evolution has ceased. 5-Nitro-2-furaldehyde (1.41 g, 10.0 mmol) is then added and the reaction mixture is stirred at room temperature for 2.5 h, upon which it is poured on ice and extracted 3 times with ethyl acetate. The organic extracts are combined, washed with brine, dried on magnesium sulfate, filtered and concentrated under reduced pressure. The residue is recrystallized from ethyl acetate, filtered, washed with ethyl acetate and dried under reduced pressure. 1.34 g of 5-(1H-imidazo[4,5-b]pyridin-2-ylsulfanyl)-furan-2-carbaldehyde is obtained as a crystalline light-brown powder. mp: 188° C.

Provenance & Evidence