Phosphorus oxychloride → Pyridine-3-sulfonyl chloride

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Phosphorus pentachloride (3.0 g, 14.6 mmol) was added to a solution of 3-pyridinesulfonic acid (1.5 g, 9.42 mmol) dissolved in phosphoryl trichloride (2.45 g, 16.0 mmol) and the mixture heated to 130° C. for 3 h under argon. The mixture was concentrated in vacuo, the residue was quenched over ice and extracted with ether. The organic phase was washed with a saturated sodium bicarbonate solution and concentrated in vacuo to give the crude title compound (0.6 g, 36%) which was used immediately without purification.

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