Potassium Carbonate → Methyl 4-tetrahydrofuran-3-ylsulfanylbenzoate

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To a suspension of methyl 4-sulfanylbenzoate (0.85 g, 5.05 mmol), potassium carbonate (1.39 g, 10.1 mmol) in DMF (10 mL) at room temperature was added 3-iodotetrahydrofuran (1.00 g, 5.05 mmol). The resulting suspension was stirred for 16 hours. The reaction mixture was diluted with DCM (25 mL), filtered and the solvent was evaporated under reduced pressure. The residue was dissolved in DCM (25 mL) and washed with water (3×15 mL) and saturated aqueous brine solution (1×15 mL). The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo to yield methyl 4-tetrahydrofuran-3-ylsulfanylbenzoate (1.03 g, 86%) as a yellow solid. ESI-MS m/z calc. 238.1. found 239.3 (M+1)+; Retention time: 1.47 minutes (3 min run); 1H NMR (400 MHz, DMSO) δ 7.91-7.83 (m, 2H), 7.48-7.39 (m, 2H), 4.16-4.08 (m, 2H), 3.91-3.72 (m, 5H), 3.55 (q, J=7.6 Hz, 1H), 2.49-2.35 (m, 1H), 1.86-1.74 (m, 1H).

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