Saccharin → HCID 555078, compound

Participants

Reaction Steps

A mixture of the sodium salt of 1,2-benzisothiazol-3(2H)-one 1,1-dioxide (0.81 g, 3.95 mmol), pentafluoropyridine (0.68 g, 4.0 mmol) and 15-Crown-5 (0.88 g, 4.0 mmol) in acetonitrile (15 ml) was heated to reflux for 6 hours, cooled, and the solvent evaporated in vacuo. The oily residue thus obtained was suspended in water and stirred for 3-4 hours. The solid which percipitated was collected by filtration and dried to afford 1.01 g (77%) of 2-(2,3,5,6-tetrafluoro-4-pyridyl)-1,2-benzisothiazol-3(2H)-one 1,1-dioxide, m.p. 164°-165° C. after recrystallization from carbon tetrachloride.

Provenance & Evidence