2-(Tributylstannyl)pyrazine → 7-Fluoro-5-methyl-6-phenyl-2-(pyrazin-2-yl)-1,3-benzoxazole-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

2-Tri-n-butylstannylpyrazine (409 mg, 1.11 mmol), dichlorobis(triphenylphosphine)palladium(II) (51.9 mg, 0.074 mmol) and 2,6-di-tert-butylcresol (32.6 mg, 0.148 mmol) were added to a toluene (20 ml) solution of 2-chloro-7-fluoro-5-methyl-6-phenyl-1,3-benzoxazole-4-cabonitrile (I-130) (212 mg, 0.739 mmol), followed by heating under reflux in an oil bath at 125° C. for 2 hours. The solvent was evaporated away under reduced pressure, then the residue was purified by silica gel column chromatography (eluent, hexane:ethyl acetate=2:1) to obtain the entitled compound (146 mg, 59.8%) as a colorless solid.

Provenance & Evidence