2-bromo-N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide → N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-2-(6-fluoro-1H-indazol-3-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide

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2-Bromo-N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (287 mg, 0.674 mmol) and 6-fluoro-3-(tributylstannyl)-1H-indazole (450 mg, 0.674 mmol) were dissolved in DMF (8 mL) under nitrogen. Pd(PPh3)4 (39 mg, 0.034 mmol) and CuI (26 mg, 0.136 mmol) were added and the mixture was sonicated for 5 min while bubbling nitrogen through it. The reaction mixture was then stirred at 85° C. for 4 h. The mixture was cooled, concentrated in vacuo and then purified by chromatography (silica, petroleum ether:EtOAC 5:1 v/v) to give N-(1-(tert-butyldimethylsilyloxy)-2-methylpropan-2-yl)-2-(6-fluoro-1H-indazol-3-yl)-5-trityl-5H-pyrrolo[3,2-b]pyrazine-7-carboxamide (100 mg, 20%) as a white solid. 1H NMR (300 MHz, CD3C1): δ 8.55 (s, 1H), 8.35 (s, 1H), 8.13 (s, 1H), 8.32 (s, 1H), 7.49-7.47 (m, 3H), 7.29-7.01 (m, 15H), 3.87 (s, 2H), 1.55 (s, 6H), 0.78 (s, 9H), 0.02 (s, 6H). LC-MS: 725.3 [M+H]+.

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