Benzenesulfonic Acid → HCID 140636156, compound

Participants

Reaction Steps

To a solution of tert-butyl 2-(methylsulfonyl)-2,6-dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylate (32.1 kg, 111 mol) in iso-propylacetate (289 kg) was added benzenesulfonic acid (35.35 kg, 223 mol). The reaction was stirred for 3 days at room temperature and then cooled to 0-10° C. and stirred an additional 1 h. The resulting slurry was filtered and the cake washed with iso-propylacetate. The solids were dried overnight under vacuum at room temperature to give 2-(methylsulfonyl)-2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-5-ium benzenesulfonate.

Provenance & Evidence