1,2-Benzisothiazol-3(2H)-one → HCID 53863787, compound

Participants

Reaction Steps

10.0 g (66 millimoles) of 2,3-dihydro-3-oxo-1,2-benzisothiazole were suspended in 140 ml of dimethylformamide, and 2.0 g (66 millimoles) of 80% strength sodium hydride were added a little at a time, while stirring thoroughly. After 15 minutes, 12.8 g (80 millimoles) of 3-bromo-2-methyl-3-cyanoprop-1-ene were slowly added dropwise, and the reaction mixture was stirred for 2 hours at 80° C. and then cooled. The solvent was distilled off under reduced pressure, the mixture was taken up in ice-water and extracted with methylene chloride, and the organic phase was washed thoroughly with H2O, dried and evaporated down. The crude product (16 g of a dark oil) was then purified by column chromatography (silica gel, mobile phase 95:5 mixture of methylene chloride and methanol). 3.5 g (23%) of 3-(2,3-dihydro-3-oxo-1,2-benzisothiazol-2-yl)-1-cyano-2-methylprop-1-ene of melting point 128°-130° C. were obtained.

Provenance & Evidence