Thionyl Chloride → Isoquinoline-5-sulfonyl chloride hydrochloride

Participants

Reaction Steps

To 1200 ml of thionyl chloride were added 150 g of 5-isoquinolinesulfonic acid and 0.4 ml of N,Ndimethylformamide. Then, the resulting mixture was refluxed while heating at 80° to 85 ° C for 3 hours, followed by removal of the thionyl chloride under reduced pressure. Subsequently, 300 ml of dichloromethane was added to the reaction mixture to precipitate crystals. The precipitated crystals were separated by filtration, washed with 100 ml of dichloromethane, and then dried under reduced pressure to obtain 170 g of 5-isoquinolinesulfonyl chloride hydrochloride.

Provenance & Evidence