Potassium Phosphate, Tribasic → 2-(6-tert-Butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-4-(5-(5-(2-methoxyethyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)-1-methyl-6-oxo-1,6-dihydropyridin-3-yl)nicotinaldehyde

Participants

Reaction Conditions

Reaction Steps

A 25-mL round-bottomed flask equipped with a reflux condenser was charged with 2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-4-chloronicotinaldehyde 103b (100 mg, 0.28 mmol), 133d (144.4 mg, 0.42 mmol), Pd(dppf)Cl2 (11.3 mg, 0.0139 mmol), K3PO4 (117.8 mg, 0.556 mmol), sodium acetate (45.6 mg, 0.556 mmol), acetonitrile (10 mL), and water (3 drops). After three cycles of vacuum/N2 flush, the mixture was heated at 100° C. for 1 h under N2 protection. Analysis of the reaction mixture by LCMS showed complete conversion to the desired product. It was cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure. The residue was purified by silica-gel column chromatography eluting with 40:1 dichloromethane/methanol to afford 133e as a yellow solid (140 mg, 80%). MS-ESI: [M+H]+ 627.3

Provenance & Evidence