Sodium hydride → Methyl 3-cyclohexyl-1-(2-(methoxycarbonyl)allyl)-2-(2-vinylphenyl)-1H-indole-6-carboxylate

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Methyl 3-cyclohexyl-2-(2-vinylphenyl)-1H-indole-6-carboxylate (7, R2=H) 508 mg, 1.4 mmol) was dissolved in THF (5 mL) under N2 and cooled to 0° C. Sodium hydride (143 mg, 60% suspension in mineral oil, 3.57 mmol) was added and the mixture was stirred at 0° C. for 5 min, when a solution of methyl 2-(bromomethyl)acrylate (276 mg, 1.54 mmol) in THF (1.5 mL) was added dropwise. Stirring was continued for 30 min at 22° C. The reaction was quenched with a saturated aqueous solution of ammonium chloride (20 mL) and extracted with EtOAc (2×30 mL) and CH2Cl2 (30 mL). The organic extracts were combined and dried over sodium sulfate, filtered and concentrated. The residue was chromatographed on silica gel using hexane/ethyl acetate (0–20%) to afford the title compound as a pale yellow solid (641 mg, 99%). ESI-MS m/z 458 (MH+).

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