HCID 19855993, compound → HCID 135549338, compound

Participants

Reaction Steps

219 mg of 4-amino-3-phenyl-5-isothiazolecarboxamide in 7.2 ml of glacial acetic acid and 4 ml of concentrated hydrochloric acid were stirred at 0° C. during the addition of a solution of 80 mg of sodium nitrite in 1.2 ml of water. The mixture was held at below room temperature overnight and the precipitated product was filtered off and recrystallized from methanol to give 164 mg of 7-phenylisothiazolo[4,5-d]-1,2,3-triazin-4(3H)-one. A sample recrystallized from aqueous methanol melted at 179°-180° C. (dec.).

Provenance & Evidence