Sodium Carbonate → methyl 3-(benzyl(methyl)amino)-2-(1-(tert-butoxycarbonyl)-1H-indazol-5-yl)quinoxaline-6-carboxylate

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To a solution of methyl 3-(benzyl(methyl)amino)-2-(trifluoromethylsulfonyloxy)quinoxaline-6-carboxylate (300 mg, crude) in ethylene glycol dimethyl ether (7 mL) was added tert-butyl 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole-1-carboxylate (181 mg, 0.53 mmol), sodium carbonate (93 mg, 0.88 mmol), and Pd(PPh3)4 (25 mg, 0.02 mmol). The resulting solution was stirred for 1 h at 90° C. under an inert atmosphere of nitrogen, quenched with water (100 mL) and extracted with dichloromethane (3×50 mL), dried over anhydrous magnesium sulfate, and concentrated under vacuum to give a residue, which was purified via silica gel chromatography (3% ethyl acetate in petroleum ether) to afford methyl 3-(benzyl(methyl)amino)-2-(1-(tert-butoxycarbonyl)-1H-indazol-5-yl)quinoxaline-6-carboxylate as a yellow solid (120 mg).

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