Hydrochloric Acid → 1(3,4-dichlorophenyl)-6-oxo-4-(piperidin-4-yloxy)-1,6-dihydropyridazine-3-carboxylic acid HCl salt

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Reaction Steps

To a stirring solution of 4-(1-(tert-butoxycarbonyl)piperidin-4-yloxy)-1-(3,4-dichlorophenyl)-6-oxo-1,6-dihydropyridazine-3-carboxylic acid (from example 15 step A) (105 mg, 0.217 mmol) in DCM (2 mL) at room temperature under argon was added 4 M HCl in dioxane (0.271 mL, 1.1 mmol). The reaction mixture was stirred at room temperature overnight. Et2O (10 mL) was added to the reaction mixture. The solid product was collected by filtration and further washed with ether (5 mL×2). After drying under reduce pressure over night, 83 mg (100%) of 1(3,4-dichlorophenyl)-6-oxo-4-(piperidin-4-yloxy)-1,6-dihydropyridazine-3-carboxylic acid HCl salt was obtained as an off-white solid. MS (ESI) 384 (M+H).

Provenance & Evidence