Hydrochloric Acid → 3,5-Bis(m-trifluoromethylphenyl)-4-(2-hydroxyethoxy)benzoic acid ethyl ester

Participants

Reaction Steps

To stirred solution of K2CO3 (2 M in H2O) (1.9 mL, 3.6 mmol) at room temperature was added dioxane (14.3 mL), 3-bromo-4-(2-hydroxyethoxy)-5-iodobenzoic acid ethyl ester (0.503 g, 1.21 mmol) and 3-trifluoromethyl-phenyl boronic acid (0.299 g, 1.57 mmol). The reaction mixture was purged with N2 for a few minutes and then [1,1′bis(diphenylphosphino)ferrocene]dichloropalladium(II), complex with CH2Cl2 (0.030 g, 0.036 mmol) was added. The reaction was stirred at room temperature for 1.5 h and then heated at reflux for 2 h. After cooling to room temperature, it was poured into a 0.1 N HCl solution and extracted with EtOAc. The combined organic layers were washed with brine and dried over MgSO4. After concentration in vacuo, the residue was first purified by flash chromatography (25% EtOAc:hexane) and then HPLC [60% CH2Cl2 (6% MTBE): 40% hexane to afford 3,5-bis-(m-trifluoromethylphenyl)-4-(2-hydroxyethoxy)benzoic acid ethyl ester (0.215 g, 36%) as a white solid 1H NMR (CDCl3) δ 8.09 (s, 2H); 7.94 (m, 2H); 7.86–7.80 (m, 2H); 7.71–7.58 (m, 4H); 4.42 (q, 2H) 3.63 (m, 4H); 1.42 (t, 3H) and 3-Bromo-5-(m-trifluoromethylphenyl)-4-(2-hydroxyethoxy)benzoic acid ethyl ester (0.173 g, 33%) as a white solid 1H NMR (CDCl3) δ 8.29 (d, 1H); 8.00 (d, 1H); 7.86 (m, 1H); 7.80–7.55 (m, 3H); 4.40 (q, 2H); 3.74–3.60 (m, 4H); 1.92 (t, 1H); 1.40 (t, 3H).

Provenance & Evidence