Phosphorus oxychloride → Pyridine-3-sulfonyl chloride hydrochloride

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-pyridinesulfonic acid (10.0 g), phosphorous pentachloride (13.1 g) and phosphoryl chloride (10.0 ml) was stirred at 130° C. for 3.5 hours. The solution was evaporated and diluted with acetone. The solution was evaporated and poured into water (200 ml) and isopropyl ether (400 ml). The organic layer was separated, washed with brine twice, saturated sodium bicarbonate aqueous solution and brine and dried over magnesium sulfate. The solution was evaporated, covered with hexane (20 ml) and added hydrogen chloride in ethyl acetate (4N, 20 ml) dropwise with stirring. The resulting solid was collected by filtration and dried to give 3-pyridinesulfonyl chloride hydrochloride (9.49 g).

Provenance & Evidence