Trifluoroacetic acid → 6-(hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine

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Reaction Steps

Trifluoroacetic acid (15 mL, 194.70 mmol) was added to a mixture of tert-butyl 5-(3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)hexahydropyrrolo[3,4-c]pyrrole-2(1H)-carboxylate (3 g, 7.53 mmol) and dichloromethane (60 mL). The resulting solution was stirred at ambient temperature for 1 hour and then evaporated to leave an involatile residue. The residue was purified by ion-exchange chromatography on an SCX column using aqueous ammonia (7M) in methanol as eluant to give 6-(hexahydropyrrolo[3,4-c]pyrrol-2(1H)-yl)-3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazine (2.200 g, 98%) as a white solid that was used without further purification.

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