反应详情

To a solution of benzofuran-5-yl(phenyl)methanone (2.45 g, 11.0 mmol), glacial acetic acid (1.27 mL, 22.0 mmol) and 1,2-ethanedithiol (1.39 mL, 16.5 mmol) in 30 mL DCM at ambient temperature was added boron trifluoride diethyletherate (1.38 mL, 11.0 mmol). The reaction was allowed to stir overnight, and was quenched by the addition of 1N NaOH. The aq. layer was extracted 1×DCM, and the combined organics were dried over sodium sulfate, filtered, and concentrated. Purification by silica gel chromatography, ISCO, 0-20% EtOAc/hexanes provided 5-(2-phenyl-1,3-dithiolan-2-yl)benzofuran as a clear/colorless oil. 1H NMR (400 MHz, DMSO-d6) δ ppm 7.99 (d, J=2.0 Hz, 1H), 7.84 (d, J=2.0 Hz, 1H), 7.48-7.57 (m, 3H), 7.38-7.45 (m, 1H), 7.29-7.36 (m, 2H), 7.24 (t, J=7.3 Hz, 1H), 6.96 (d, J=2.0 Hz, 1H) 3.43 (s, 4H).

1. customwas quenched by the addition of 1N NaOH
2. extractionThe aq. layer was extracted 1×DCM
3. dry with materialthe combined organics were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by silica gel chromatography, ISCO, 0-20% EtOAc/hexanes