Cesium carbonate → (2-(6-tert-Butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-4-(1-methyl-5-(4-methyl-6,7-dihydro-4H-pyrazolo[5,1-c][1,4]oxazin-2-ylamino)-6-oxo-1,6-dihydropyridin-3-yl)pyridin-3-yl)methyl acetate

Participants

Reaction Conditions

Reaction Steps

A 25-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 150h (25 mg, 1.0 eq., 0.16 mmol), (4-(5-bromo-1-methyl-6-oxo-1,6-dihydropyridin-3-yl)-2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)pyridin-3-yl)methyl acetate 142c (181 mg, 2.0 eq., 0.32 mmol), Pd2(dba)3 (15 mg, 0.1 eq., 0.016 mmol), Xantphos (19 mg, 0.2 eq., 0.032 mmol), Cs2CO3 (105 mg, 2.0 eq., 0.32 mmol), and dioxane (10 mL). The mixture was subjected to three cycles of vacuum/argon flush and stirred at 100° C. for 2 hr. 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 150i as a brown solid (48 mg, 48%).

Provenance & Evidence