Hydrochloric Acid → 3-{2-Methyl-4-[3-methyl-5-(2-pyridin-2-yl-4-trifluoromethyl-phenoxy)-phenoxy]-phenyl}-propionic acid

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Reaction Steps

A mixture of 3-{4-[3-(2-bromo-4-trifluoromethyl-phenoxy)-5-methyl-phenoxy]-2-methyl-phenyl}-propionic acid ethyl ester (0.155 g, 0.289 mmol) and 2-tributylstannyl pyridine (0.210 g, 0.571 mmol) in dry toluene (8 mL) is purged with N2 and then tetrakis(triphenylphospine)pallium (0) (0.033 g, 0.029 mmol) is added. The reaction is heated to 100° C. and stirred for 20 hours under N2. The reaction is cooled, and the solvent is removed in vacuo to give crude 3-{2-methyl-4-[3-methyl-5-(2-pyridin-2-yl-4-trifluoromethyl-phenoxy)-phenoxy]-phenyl}-propionic acid ethyl ester. This ester is dissolved in ethanol (8 mL), treated with 5 N NaOH (2 mL) and heated to reflux until saponification is complete. The mixture is cooled, and the solvent is removed in vacuo to afford a residue that is acidified with 1 N HCl. The mixture is diluted with water and extracted with ethyl acetate. The organic layer is dried (Na2SO4), and the solvent is removed in vacuo to give crude product that is purified by preparative HPLC to afford 0.056 g (38%) of the title compound. 1H NMR (400 MHz, CDCl3); MS (ES+) m/z mass calculated for C29H24NO4F3 507, found 508 (M+1, 100%).

Provenance & Evidence