Methyl 3-bromoimidazo[1,2-b]pyridazine-6-carboxylate → 3-(6-(trifluoromethyl)-1H-indazol-4-yl)imidazo[1,2-b]pyridazine-6-carboxylic acid

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To a 10 mL vial was added a mixture of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6-(trifluoromethyl)-1H-indazole (0.066 g, 0.211 mmol), methyl 3-bromoimidazo[1,2-b]pyridazine-6-carboxylate (0.054 g, 0.211 mmol) and PdCl2(dppf) (7.74 mg, 10.57 μmol) in dioxane (2 mL) and aqueous saturated NaHCO3 (1 mL). The resulting orange suspension was heated at 140° C. for 30 minutes in a microwave reactor. The major peak by LCMS was the decarboxylated product. The reaction mixture was extracted into EtOAc and the water layer was separated and acidified with concentrated HCl to pH 2. The water layer was extracted with EtOAc. The organic layers were combined, dried over Na2SO4, filtered, and concentrated to give an oil, which was used without further purification (36 mg).

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