p-Toluenesulfonic acid monohydrate → 4-(((1R,3S)-3-amino-2,2,3-trimethylcyclopentyl)amino)-6-(5-(methylthio)-1,3,4-thiadiazol-2-yl)pyrrolo[1,2-b]pyridazine-3-carboxamide

Participants

Reaction Steps

A solution of methyl 2-(4-((1R,3S)-3-(tert-butoxycarbonylamino)-2,2,3-trimethylcyclopentylamino)-3-carbamoylpyrrolo[1,2-b]pyridazine-6-carbonyl)hydrazinecarbodithioate (466.5 mg, 0.849 mmol) and p-toluenesulfonic acid monohydrate (404 mg, 2.122 mmol) in ethanol (4 mL) was heated to 120° C. for 50 minutes. The reaction mixture was concentrated to yield 4-(((1R,3S)-3-amino-2,2,3-trimethylcyclopentyl)amino)-6-(5-(methylthio)-1,3,4-thiadiazol-2-yl)pyrrolo[1,2-b]pyridazine-3-carboxamide (763 mg, 94% yield). MS (ES+) m/z: 432.08 (M+H); HPLC retention time: 2.493 min (analytical HPLC Method F).

Provenance & Evidence