Reaction Steps
A solution of 2-{3-[3-(5-benzyloxy-2-ethyl-4-thiazol-2-yl-phenoxy)propoxy]-2-propylphenoxy}benzoic acid methyl ester (282 mg, 0.442 mmol) in ethanethiol (3 mL) was treated with boron trifluoride etherate (0.56 mL, 4.4 mmol) at room temperature for 3 h. The reaction mixture was diluted with water, concentrated in vacuo, and extracted with diethyl ether. The organic layer was dried (magnesium sulfate), filtered, and concentrated in vacuo. Chromatography (silica gel, ethyl acetate/hexane) provided 107 mg (44%) of the title compound. 1H NMR (CDCl3) δ 7.88 (dd, J=8, 2 Hz, 1H), 7.80 (d, J=4 Hz, 1H), 7.35 (dt, J=8, 2 Hz, 1H), 7.28 (d, J=4 Hz, 1H), 7.24 (s, 1H), 7.09 (dt, J=9, 2 Hz, 1H), 7.05 (t, J=9 Hz, 1H), 6.79 (d, J=9 Hz, 1H), 6.66 (d, J=9 Hz, 1H), 6.61 (s, 1H), 6.42 (d, J=9 Hz, 1H), 4.24 (t, J=6 Hz, 2H), 4.18 (t, J=6 Hz, 2H), 3.81 (s, 3H), 2.63 (t, J=7 Hz, 2H), 2.58 (q, J=7 Hz, 2H), 2.34 (quintet, J=6 Hz, 2H), 1.52 (hextet, J=8 Hz, 2H), 1.17 (t, J=7 Hz, 3H), 0.88 (t, J=7 Hz, 3H); MS ES+ m/e 548 (p+1).
