Pyridine → 3-Fluoro-2-formyl-5-(tetrahydro-2H-pyran-2-yloxy)phenyl trifluoromethanesulfonate

Participants

Reaction Steps

To a mixture of 2-fluoro-6-hydroxy-4-(tetrahydro-2H-pyran-2-yloxy)benzaldehyde (3.60 g, 15.0 mmol) and pyridine (5.93 g, 75.0 mmol) in dichloromethane (50 mL) was added dropwise Tf2O (6.35 g, 22.5 mmol) at −15° C. After stirring at room temperature for 3 h, the reaction was quenched by addition of iced-brine (50 mL) and extracted with dichloromethane (2×50 mL). The combined organic layers were dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography (EtOAc/PE=1/8) on silica gel to give the title compound as a white solid (3.77 g, Yield: 67.5%). 1H NMR (400 MHz, DMSO-d) δ 10.12 (s, 1H), 7.26-7.30 (m, 1H), 7.04 (s, 1H), 5.78 (s, 1H), 3.62-3.71 (m, 2H), 1.80-1.87 (m, 3H), 1.56-1.64 (m, 3H). MS (ESI) m/z=373 [M+H]+.

Provenance & Evidence