Dichloromethane → 5-Benzyl-3H-isobenzofuran-1-one

Beteiligte Stoffe

Reaktionsschritte

A mixture of 5-bromo-3H-isobenzofuran-1-one (14 mmol, 3.04 g), benzylzinc bromide solution (0.5 M in THF, 28 mmol, 56 mL), [1,1′bis(diphenylphosphino)-ferrocene]dichloropalladium(II) 1:1 complex with CH2Cl2 (0.07 mmol, 57 mg), and anhydrous 1.4-dioxane (70 mL) was refluxed with stirring under nitrogen for 40 h. After cooling to ambient temperature silica gel was added and the mixture was concentrated in vacuo. The residue was added on top of a chromatography column filled with silica gel. Elution with hexanes:ethyl acetate=9:1 gave a yellow solid. Further purification by recrystallization from ethyl acetate/hexanes gave the title compound (1.37 g) as white needles; 1H NMR (CDCl3, 200 MHz): δ=7.83 (d, 1H), 7.16 to 7.39 (m, 7H), 5.26 (s, 2H), 4.11 (s, 2H).

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