Sodium Carbonate → Ethyl 4-[4-(trifluoromethyl)cyclohex-1-en-1-yl]benzoate

Beteiligte Stoffe

Reaktionsschritte

To a cooled (−78° C.) solution of 4-trifluoromethyl cyclohexanone (3.00 grams, 18.1 mmol) in anhydrous THF (100 mL) was added lithium bis(trimethylsilyl)amide (19.9 mL, 1.0 M in THF, 19.9 mmol) dropwise. After 10 min, a solution of 2-[N,N-bis(trifluoromethylsulfonyl)amino]5-chloropyridine (7.09 g, 18.1 mmol) in THF (20 mL) was added, and the resulting mixture was allowed to warm slowly to ambient temperature overnight, at which point it was quenched by pouring into sat. aq. NaHCO3. The mixture was extracted with EtOAc. The organic phase was separated, dried over anhydrous sodium sulfate, and concentrated in vacuo. The resulting enol triflate was used without further purification. To a flask containing the unpurified enol triflate were added 4-ethoxycarbonylphenylboronic acid (3.68 g, 18.69 mmol) and trans-dichlorobis(triphenylphosphine) palladium (II) (633 mg, 0.903 mmol). Acetonitrile (90 mL) and sodium carbonate (45 mL, 1.0 M aqueous, 45.0 mmol) were added, and the resulting mixture was degassed via nitrogen sparge. The reaction mixture was stirred at 70° C. for 1.5 h, then was allowed to cool to room temperature and was poured into water. The mixture was extracted with EtOAc, and the organic phase was concentrated in vacuo. Purification by chromatography on silica gel (0 to 10% EtOAc in hexanes, then 10 to 100% EtOAc) provided the title compound: LCMS m/z 299.5 [M+H]+; 1H NMR (500 MHz, CDCl3) δ 7.99 (d, J=8.5 Hz, 2H), 7.42 (d, J=8.5 Hz, 2H), 6.20-6.18 (m, 1H), 4.37 (q, J=7.0 Hz, 2 H), 2.61-2.18 (m, 6H), 1.74-1.68 (m, 1H), 1.39 (t, J=7.0 Hz, 3H).

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