Tert-butyl 2-[4-(bromomethyl)phenoxy]-2,2-difluoroacetate → Methyl 4-[1-{4-[2-(tert-butoxy)-1,1-difluoro-2-oxoethoxy]benzyl}-2-(4-fluorophenyl)-2-oxoethyl]benzoate

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Reaction Steps

To a solution of methyl-4-[2-(4-fluorophenyl)-2-oxoethyl]benzoate (0.150 g, 0.551 mmol) (Example 1, Step 2) in degassed THF at −20° C. was added potassium tert-butoxide (0.606 ml), followed by a solution of tert-butyl 2-[4-(bromomethyl)phenoxy]-2,2-difluoroacetate (H. Fretz, Tetrahedron 54, 4849, 1998) (0.203 g, 0.604 mmol) in THF (0.5 ml). The reaction was allowed to warm slowly to room temperature, and was then quenched with saturated ammonium acetate solution and extracted with ethyl acetate. The organic phase was dried over sodium sulfate, filtered and evaporated to dryness. The residue was purified by flash chromatography using toluene/ethyl acetate 5% giving 0.176 g of the title compound.

Provenance & Evidence