Cesium carbonate → (S)-tert-Butyl 4-(5-(5-Bromo-1-methyl-2-oxo-1,2-dihydropyridin-3-ylamino)pyrazin-2-yl)-3-methylpiperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A 250-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 230c (1.25 g, 4.3 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (3.4 g, 12.9 mmol), Pd2(dba)3 (394 mg, 0.43 mmol), Xantphos (497 mg, 0.86 mmol), Cs2CO3 (4.7 g, 14.6 mmol), and 1,4-dioxane (80 mL). After three cycles of vacuum/argon flush, the mixture was heated at 90° C. for 2 hrs. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the resulting residue was purified by silica-gel column chromatography eluting with dichloromethane/methanol (50:1 to 30:1) to afford 230d (1.9 g, 72%). MS: [M+H]+ 481.2.

Provenance & Evidence