Potassium Carbonate → (+/-)-(4-Phenyl-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate

Participants

Reaction Conditions

Reaction Steps

To a solution of (±)-(4-bromo-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate (2.05 g, 5.21 mmol) and phenylboronic acid (0.952 g, 7.81 mmol) in dioxane (50 mL) heated to 100° C. was added dichlorobis(tri-o-tolylphosphine)-palladium(II) (0.205 g, 0.261 mmol) and potassium carbonate (1.80 g, 13.04 mmol) and the reaction mixture was allowed to stir at 100° C. for 12 h. The reaction mixture was cooled to room temperature, diluted with diethyl ether (250 mL), and filtered (celite). The organic layer was washed with water (2×100 mL) and saturated aqueous sodium chloride (100 mL), was dried (magnesium sulfate), and the solvent was removed in vacuo to provide a crude oil. Purification by flash column chromatography (silica, ethyl acetate:hexanes 1:9) provided 1.45 g (73%) of (±)-(4-phenyl-2,3-dihydro-1-benzofuran-2-yl)methyl 4-methylbenzenesulfonate as a clear oil. Rf=0.34 (silica, ethyl acetate:hexanes 1:4); Anal. calcd. for C22H20O4S: C, 69.45; H, 5.30. Found: C, 69.17; H, 5.30.

Provenance & Evidence