2-bromo-N-(tert-butyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide → 2-(5-difluoromethoxy-1H-indazol-3-yl)-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid tert-butylamide

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In a 25 mL round-bottomed flask, 2-bromo-N-tert-butyl-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (220 mg, 515 μmol) and 5-(difluoromethoxy)-3-(tributylstannyl)-1H-indazole (268 mg, 566 μmol.10) were dissolved in DMF (1.06 mL) under argon, tetrakis(triphenylphosphine)palladium (0) (29.7 mg, 25.7 μmol) and CuI (19.6 mg, 103 μmol, Eq: 0.20) were added and the mixture sonicated for 5 min with bubbling argon. The reaction mixture was stirred at 90° C. (oil bath temperature) for 2.5 h. The reaction mixture was concentrated under high vacuum and the residue was purified by chromatography (80 g column, 50 μm from Analogix, 0-50% EtOAc in hexanes over 30 min) to give N-tert-butyl-2-(5-(difluoromethoxy)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (159 mg, 300 μmol, 58.2%) as an off-white solid. MS (M+Na)+=553 (>90% purity); 1H NMR (CDCl3) δ: 10.74 (br. s., 1H), 9.29 (s, 1H), 8.42 (s, 1H), 8.36 (d, J=2.3 Hz, 1H), 8.09 (s, 1H), 7.64 (d, J=9.1 Hz, 1H), 7.40 (dd, J=8.9, 2.1 Hz, 1H), 6.57 (t, J=74.0 Hz, 1H), 5.76 (s, 2H), 3.56-3.70 (m, 2H), 1.67 (s, 9H), 0.92-1.04 (m, 2H), 0.00 (s, 9H).

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