Cesium carbonate → (4-(5-(4,5-Dimethyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)-1-methyl-6-oxo-1,6-dihydropyridin-3-yl)-2-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)pyridin-3-yl)methyl Acetate

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A 25-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 287i (20 mg, 1.0 eq., 0.12 mmol), (4-(5-bromo-1-methyl-6-oxo-1,6-dihydropyridin-3-yl)-2-(1-oxo-3,4,6,7,8,9-hexahydropyrazino[1,2-a]indol-2(1H)-yl)pyridin-3-yl)methyl acetate 273a (127 mg, 2.0 eq., 0.24 mmol), Pd2(dba)3 (9.0 mg, 0.1 eq., 0.010 mmol), Xantphos (11 mg, 0.2 eq., 0.020 mmol), Cs2CO3 (78 mg, 2.0 eq., 0.24 mmol), and dioxane (5 mL). After three cycles of vacuum/N2 flush, the mixture was stirred at 100° C. for 2 h. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure. The resulting residue was purified by silica-gel column chromatography eluting with 20:1 dichloromethane/methanol to afford 287j as a brown solid (60 mg, 82%). MS-ESI: [M+H]+ 610.9

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