Ethyl 2-(triphenylphosphoranylidene)propionate → (E)-ethyl 2-methyl-3-(3,4,5-trifluorophenyl)acrylate

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To a solution of dry DMF (50 mL) under N2 was added 3,4,5-trifluorobenzaldehyde (4.26 g, 26.6 mmol) followed by ethyl 2-(triphenylphosphoranylidene)propionate (10.6 g, 29.3 mmol) in portions, keeping the solution at room temperature. After 1 hour, TLC (10% EtOAC in Hexanes) showed complete conversion, and the solvent was removed by rotary evaporation. The resulting material was brought up in 50 mL methyl t-butyl ether (MBTE) and the precipitate removed by filtration and washed with additional MBTE (3×50 mL). After concentration, the resulting filtrate was applied onto a silica gel column (25% EtOAc in hexanes) resulting in 6.0 g of the title compound (93%) as a white powder.

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