Hydrogen Peroxide → [(S)-6-((R)-7-Fluoro-4-hydroxyindan-1-yloxy)-2,3-dihydrobenzofuran-3-yl]-acetic acid methyl ester

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Reaction Steps

Aqueous hydrogen peroxide solution (35%, 3.7 mL) is added dropwise to a solution of {(S)-6-[(R)-7-fluoro-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-indan-1-yloxy]-2,3-dihydro-benzofuran-3-yl}-acetic acid methyl ester (5.0 g) in acetic acid (30 mL) chilled in an ice bath. The solution is stirred with cooling for 0.5 h and at room temperature for another 2 h. Ice-cold water (50 mL) and 2 N aqueous NaOH solution (20 mL) are added, and the mixture is stirred at room temperature overnight. The mixture is extracted with ethyl acetate, and the combined extracts are washed with brine and dried (MgSO4). The solvent is evaporated and the residue is chromatographed on silica gel (cyclohexane/ethyl acetate 80:20→60:40) to give the title compound. LC (method 2): tR=1.01 min; Mass spectrum (ESI+): m/z=359 [M+H]+.

Provenance & Evidence