Trifluoroacetic acid → (S)-1-(4-(4-chlorophenoxy)phenyl)-5-(3-(trifluoromethyl)phenyl)imidazolidin-2-one

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Reaction Steps

(S)-3-[4-(4-chloro-phenoxy)-phenyl]-1-(4-methoxy-benzyl)-4-(3-trifluoromethyl-phenyl)-imidazolidin-2-one (2.1 g, 3.8 mmol) is treated with TFA (15 mL) at room temperature for 14 h. The excess of TFA is removed under vacuum and the residue is treated with saturated NaHCO3 aqueous solution (50 mL) and extracted with EtOAc (3×100 mL). The combined organic layer is washed with brine and dried (MgSO4). After removing the drying agent, the solution is concentrated and purified by flash column chromatography (silica gel, EtOAc/hexane 0%˜70%) to provide the desired product (S)-1-[4-(4-chloro-phenoxy)-phenyl]-5-(3-trifluoromethyl-phenyl)-imidazolidin-2-one as white crystals (1.5 g, 91%). 1H NMR (CDCl3, 400 MHz) δ 7.45˜7.58 (m, 4H), 7.29 (d, 2H), 7.23 (d, 2H), 6.87 (m, 4H), 5.34 (dd, 1H), 4.82 (br, 1H), 4.01 (t, 1H), 3.35 (dd, 1H); HPLC-MS calculated for C22H16ClF3N2O2 (M+H+) 433.1, found 433.1.

Provenance & Evidence