Ammonium Acetate → Isopropyl 4-[1-{4-[[di(tert-butoxy)phosphoryl](difluoro)methyl]benzyl}-2-(4-fluorophenyl)-2-oxoethyl]benzoate

Participants

Reaction Steps

To a solution of isopropyl-4-[2-(4-fluorophenyl)-2-oxoethyl]benzoate (0.130 g, 0.433 mmol), (Example 4, Step 1) 18-crown-6 (0.03 g) in THF (2.2 ml ) at −2020 C. was added a solution of potassium tert-butoxide 1 M in THF (0.475 ml). To the reaction mixture was added a solution of di(tert-butyl) [4-(bromomethyl)phenyl](difluoro)methylphosphonate (0.196 g, 0.475 mmol) in THF (5 ml). The reaction was stirred at room temperature for 1 hour, and then saturated ammonium acetate solution (20 ml) was added and the mixture was extracted with ethyl acetate (20 ml). The organic phase was washed with brine, dried over sodium sulfate, filtered, and evaporated to dryness. The residue was purified by flash chromatography using hexane/ethyl acetate 15% plus 1% triethylamine giving 0.05 g of the title compound.

Provenance & Evidence