Potassium Phosphate, Tribasic → (R)-2-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-4-fluoro-6-(1-methyl-5-(5-(2-methyl-4-(oxetan-3-yl)piperazin-1-yl)pyridin-2-ylamino)-6-oxo-1,6-dihydro-pyridin-3-yl)benzaldehyde

Participants

Reaction Conditions

Reaction Steps

A 50-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with (R)-1-methyl-3-(5-(2-methyl-4-(oxetan-3-yl)piperazin-1-yl)pyridin-2-ylamino)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2(1H)-one (173 mg, 1.0 eq., 0.36 mmol), 2-bromo-6-(6-tert-butyl-8-fluoro-1-oxophthalazin-2(1H)-yl)-4-fluorobenzaldehyde 101i (152 mg, 1.0 eq., 0.36 mmol), K3PO4 (152 mg, 2.0 eq., 0.72 mmol), PdCl2(dppf) (26 mg, 0.1 eq., 0.036 mmol), NaOAc (59 mg, 2.0 eq., 0.72 mmol), CH3CN (20 mL), and H2O (0.8 mL). After three cycles of vacuum/argon flush, the mixture was heated at 80° C. for 2 h. 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 40:1 DCM/EtOH to afford 107a as yellow solid (77 mg, 31%). MS: [M+H]+ 696.3.

Provenance & Evidence