Triphenylphosphine → 1-(6-Fluoro-4-((2-phenylthiazol-4-yl)methoxy)benzofuran-2-yl)ethanone

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Benzene was added to 1-(6-fluoro-4-hydroxybenzofuran-2-yl)ethanone (Example 36C, 178 mgs, 0.917 mmol) and the mixture was sonicated for 30 sec. and concentrated in vacuo to remove traces of water in the starting material. Triphenylphosphine (373 mgs, 1.421 mmol) was added and the mixture was dried on high vacuum for 10 min. (2-Phenylthiazol-4-yl)methanol (Example 3B, 175 mgs, 0.917 mmol) and THF (15 mL) were added and the mixture was sonicated/heated for 5 min. Diisopropyl azodicarboxylate (275 L, 1.412 mmol) in THF (2 mL) was added dropwise over 1 h and the resulting yellow solution was sonicated for 15 min. and stirred overnight at r.t. The mixture was diluted in dichloromethane, washed with saturated. NaHCO3, brine, dried over MgSO4 and concentrated. The residue was purified on silica gel chromatography (ISCO 24 g gold column, using 5% ethyl acetate in hexanes to 40% (10% increments)) to give the title material (132 mgs, 32%) as a white solid. LC (Method B): 2.613 min. LCMS (APCI) calcd for C20H15FNO3S [M+H]+ m/z 368.07, found 368.2. 1H NMR (CDCl3, 400 MHz) δ ppm: 7.94-8.02 (m, 2H), 7.62-7.67 (m, 1H), 7.44-7.51 (m, 3H), 7.38 (s, 1H), 6.91-6.96 (m, 1H), 6.64-6.72 (m, 1H), 5.39 (d, J=0.78 Hz, 2H), 2.58 (s, 3H).

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