Sodium Dithionite → HCID 85898859, compound

Participants

Reaction Steps

A solution of sodium dithionite (90.5 g, 520 mmol), available as approximately 85% pure sodium hydrosulfite, in water (200 mL) was added to a solution of (5-chloropentyl)-(2,3-dimethyl-5-nitro-6-phenoxy-pyridin-4-yl)amine (37.8 g, 104 mmol) in ethanol (575 mL), and the mixture was stirred rapidly for five hours. The mixture did not become homogeneous, and additional ethanol (200 mL) was added. The mixture remained heterogeneous and was separated into two batches. A solution of sodium dithionite (40 g, 230 mmol) in water (150 mL) was partitioned evenly between the two batches, and the reactions were stirred for an additional hour. An analysis by TLC indicated that the reactions were complete. A white solid was removed from the reaction mixtures by filtration and was washed with methanol. The solvents were removed under reduced pressure, and the residue was partitioned between dichloromethane (400 mL) and water (100 mL). Saturated aqueous sodium bicarbonate was added to the aqueous layer until it was basic, and the resulting solution was extracted with dichloromethane (2×100 mL). The combined organic extracts were washed with brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure to provide 34.7 g of N4-(5-chloropentyl)-5,6-dimethyl-2-phenoxypyridine-3,4-diamine as an orange-red liquid.

Provenance & Evidence