1-(diphenylmethyl)-1H-indole-2,3-dione → 1-(diphenylmethyl)-3-hydroxy-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of 3-methoxy-4-methylphenol (Jorgensen, E. C., et al., J. Med. Chem. (1971), 14:1199-202) (7.5 g, 54.3 mmol) in dichloromethane (160 mL) was added isopropylmagnesium chloride (29.0 mL, 2 M in tetrahydrofuran, 58 mmol) at 0° C. The resultant mixture was stirred at 0° C. for 30 min followed by the addition of 1-benzhydrylindoline-2,3-dione (10.4 g, 36.3 mmol). The reaction mixture was stirred at ambient temperature for 10 min and concentrated in vacuo to dryness. The residue was dissolved in ethyl acetate (300 mL) and washed with saturated ammonium chloride solution (2×200 mL). The ethyl acetate layer was dried over magnesium sulfate, filtered and concentrated in vacuo to afford 1-(diphenylmethyl)-3-hydroxy-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one (19.10 g) as a crude brown oil: MS (ES−) m/z 450.3 (M−1).

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