P-Xylene → 2-[4-(Acetyloxy)-3-fluorophenyl]-7-vinyl-1,3-benzoxazol-5-yl acetate

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Dichlorobis(tri-o-tolylphosphine)palladium (II) (46 mg, 0.06 mmol) was added into a mixture 4-[5-(acetyloxy)-7-bromo-1,3-benzoxazol-2-yl]-2-fluorophenyl acetate (0.8 g, 1.98 mmol), tributyl(vinyl)tin (0.9 g, 2.8 mmol) and p-xylene (9 mL). The reaction mixture was stirred at 130° C. for 5 h, cooled to room temperature, diluted with ethyl ether (10 mL) and treated with activated carbon. The mixture was filtered through MgSO4 and concentrated. Purification by flash chromatography (hexanes/EtOAc 5/1) gave a white solid (0.4 g, 56% yield, m.p. 154-156° C.); MS m/e 356 (M+H)+.

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