Boron trifluoride etherate → 2-{3-[3-(2-Ethyl-5-hydroxy-4-thiazol-4-yl-phenoxy)propoxy]-2-propyl-phenoxy}benzoic acid

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A solution of 2-{3-[3-(5-benzyloxy-2-ethyl-4-thiazol-4-yl-phenoxy)propoxy]-2-propyl-phenoxy}benzoic acid methyl ester (243 mg, 0.366 mmol) in ethanethiol (7 mL) was treated with boron trifluoride etherate at room temperature for 4 h. The mixture was diluted with diethyl ether, washed once with water, once with saturated sodium bicarbonate solution, dried (sodium sulfate), filtered, and concentrated in vacuo. Chromatography (silica gel, 15% ethyl acetate/85% hexane) of the residue provided 131 mg (65%) of the title compound as a colorless oil. 1H NMR (CDCl3) δ 8.88 (d, J=1 Hz, 1H), 7.88 (dd, J=8, 1 Hz, 1H), 7.44 (d, J=1 Hz, 1H), 7.38 (m, 2H), 7.08 (m, 2H), 6.81 (d, J=8 Hz, 1H), 6.68 (d. J=8 Hz, 1H), 6.55 (s, 1H), 6.43 (d, J=8 Hz, 1H), 4.21 (t, J=6 Hz, 4H), 3.83 (s, 3H), 2.63 (m, 4H), 2.33 (quintet, J=6 Hz, 2H), 1.56 (hextet, J=8 Hz, 2H), 1.19 (t, J=8 Hz, 3H), 0.91 (t, J=7 Hz, 3H); TOF MS ES+ exact mass calculated for C31H34NO6S (p+1): m/z=548.2107. Found: 548.2085.

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