Ethyl Acetoacetate → ethyl 4-(1-ethoxy-1,3-dioxobutan-2-yl)-7-o-tolyl-1H-indole-2-carboxylate

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Reaktionsschritte

A mixture of ethyl 4-chloro-7-o-tolyl-1H-indole-2-carboxylate (EXAMPLE 166C) (0.93 g), ethyl 3-oxobutanoate (0.849 g), di-tert-butyl(2′-methylbiphenyl-2-yl)phosphine (0.093 mg), K3PO4 (3.46 g), and palladium(II) acetate (0.033 g) in toluene (8 mL) was degassed via vacuum/nitrogen cycle three times. The reaction mixture was heated at 93° C. for 14 hours. The reaction mixture was partitioned between water and ethyl acetate. The organic layer was separated, and the aqueous layer was extracted with additional ethyl acetate. The combined organic layers were washed with brine, dried over MgSO4, filtered, and concentrated. The residue was purified with flash chromatography on silica gel (ethyl acetate in hexanes) to give the title compound.

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