Cesium carbonate → tert-Butyl 3-(3-(7-(tert-butylcarbamoyl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazin-2-yl)-5-(difluoromethoxy)-1H-indazol-1-yl)propyl(methyl)carbamate

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N-tert-Butyl-2-(5-(difluoromethoxy)-1H-indazol-3-yl)-5-((2-(trimethylsilyl)ethoxy)methyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxamide (280 mg, 528 μmol), tert-butyl 3-chloropropyl(methyl)carbamate (110 mg, 528 μmol) and cesium carbonate (516 mg, 1.58 mmol) in dimethylformamide (4 mL) were heated in a microwave at 100° C. for 30 min. The mixture was partitioned between ethyl acetate and water, then the organic phase washed with water 3 times, dried, filtered and concentrated. The crude residue was used in the next step without purification. MS (M+H)+=702.

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