Chlorosulfonic acid → 5-(2-chloro-pyridine-3-carbonyl)-1H-pyrrole-3-sulfonyl chloride

Participants

Reaction Conditions

Reaction Steps

Chlorosulfonic acid (6.6 mL, 100 mL) was added dropwise to (2-chloro-pyridin-3-yl)-(1H-pyrrol-2-yl)-methanone (from Example 2, 2.06 g, 10 mmol) at 0° C. After stirring at 0° C. for 24 hours, the reaction was poured slowly into ice water. The precipitate was collected by vacuum filtration, washed with water and dried to give 2.9 g (95%) of 5-(2-chloro-pyridine-3-carbonyl)-1H-pyrrole-3-sulfonyl chloride as a white solid.

Provenance & Evidence