Sodium Carbonate → (S)-methyl 2-(1-(tert-butoxycarbonyl)-1H-indazol-5-yl)-3-(2-methyl-4-(pyridin-2-yl)piperazin-1-yl)quinoxaline-6-carboxylate

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To a solution of (S)-methyl 3-(2-methyl-4-(pyridin-2-yl)piperazin-1-yl)-2-(trifluoromethylsulfonyloxy)quinoxaline-6-carboxylate (240 mg, 0.38 mmol) in ethylene glycol dimethyl ether (20 ml) was added Pd(PPh3)4 (27 mg, 0.02 mmol), sodium carbonate (74.3 mg, 0.69 mmol) in water (6 ml), and tert-butyl 5-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-indazole-1-carboxylate (300 mg, 0.87 mmol). After stirring 90 minutes at 90° C. in an oil bath, the reaction was then quenched by the addition of water (200 ml), extracted with dichloromethane (3×30 ml), dried over anhydrous magnesium sulfate and concentrated under vacuum to afford a residue, which was purified via silica gel chromatography (20% ethyl acetate in petroleum ether) to afford (S)-methyl 2-(1-(tert-butoxycarbonyl)-1H-indazol-5-yl)-3-(2-methyl-4-(pyridin-2-yl)piperazin-1-yl)quinoxaline-6-carboxylate as a yellow solid (134 mg, 60%).

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