HCID 66579130, compound → HCID 68228763, compound

Participants

Reaction Steps

A solution of ethyl 1-(1-oxidopyridin-3-yl)-1,4-dihydrothiochromeno[4,3-c]pyrazole-3-carboxylate 5,5-dioxide (637 mg) in acetic anhydride (30 mL) is heated to 130° C. for 2 h under nitrogen. After completion of the reaction, the reaction mass is concentrated under reduced pressure and triturated in water, filtered and dried to afford 700 mg (99%) of the title compound. MS (ESI+): 442.0.

Provenance & Evidence