Triethylamine → Benzofuran-5-yl(phenyl)methanone

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To a solution of benzofuran-5-yl(phenyl)methanol (4.0 g, 18 mmol) and triethylamine (7.3 mL, 54 mmol) in 30 mL 1:1 DCM/DMSO under nitrogen at 0° C. was added a solution of SO3*py (8.5 g, 54 mmol) in 20 mL DMSO dropwise via addition funnel. The reaction was allowed to stir 5 h at 0° C. and was quenched by addition of water and 250 mL Et2O. The organic layer was washed with water, 1N HCl, 1N NaOH, brine, and was dried over sodium sulfate, filtered, and concentrated. The resulting solid benzofuran-5-yl(phenyl)methanone was used without further purification. MS (ESI) m/z: Calculated: 222.1; Observed: 223.0 (M++1).

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