Pentafluoropyridine → 2-(4-Benzyloxycarbonylphenoxy)-3,4,5,6-tetrafluoropyridine

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Reaction Steps

33.8 g of pentafluoropyridine (0.2 mol) are dissolved in 500 ml of dimethylformamide, the solution is cooled to OC by means of a cryostat, and a solution of 53.3 g of potassium 4-benzyloxycarbonylphenoxide (0.2 mol) in 400 ml of dimethylformamide is then added dropwise over the course of 2 hours. After 24 hours at 0° C., the potassium salt has reacted. The dimethylformamide is then removed in a rotary evaporator, the residue is taken up in a little tetrahydrofuran, and the solution is filtered through a silica-gel column. The clear solution obtained is evaporated in a rotary evaporator until the reaction product precipitates out. The reaction product is then stirred in n-hexane, filtered off via a fluted filter and then dried for 48 hours under nitrogen at 40° C./10 mbar in a vacuum drying cabinet (yield: 91%).

Provenance & Evidence