Potassium Carbonate → Methyl 2-fluoro-6-hydroxy-4-(methylsulfonyl)benzoate

Participants

Reaction Conditions

Reaction Steps

Methyl 4-bromo-2-fluoro-6-hydroxybenzoate (1.7 g, 5.6 mmol), sodium methanesulfinate (95%) (0.91 g, 8.5 mmol), CuI (0.64 g, 3.4 mmol), L-proline (0.78 g, 6.8 mmol) and K2CO3 (0.47 g, 3.4 mmol) was dissolved in DMSO (dry) (10 ml). Nitrogen was bubbled through the solution for 15 min. The mixture was stirred and heated at 95° C. for 6 h under nitrogen. After cooling to RT, the mixture was filtered on a plug of silica and eluted with ETOAc. The filtrate was washed with 1M citric acid. The waterlayer was extracted once with EtOAc. The combined organic phases were washed with brine, dried (Na2SO4), filtered and concentrated. Purification on flash column chromatography (isooctane/EtOAc) gave the crude title compound (0.14 g). MS m/z (rel. intensity, 70 eV) 248 (M+, 36), 216 (bp), 173 (19), 125 (20), 81 (24).

Provenance & Evidence