Diethyl [(2-bromophenyl)methylidene]propanedioate → Ethyl 3-(2-bromophenyl)-2-ethoxycarbonyl-3-methylpropionate

Beteiligte Stoffe

Reaktionsschritte

To a solution in 500 ml of ether of 50.98 g of ethyl α-ethoxycarbonyl-o-bromo-cinnamate (170.5 mmole) and 1.0 g of copper bromide was added dropwise 56.7 ml of an ethereal solution of methylmagnesium bromide (175.6 mmole) at -20° C. The mixture was stirred overnight at room temperature, diluted with an aqueous ammonium chloride solution to separate the phases. The organic phase was dried over magnesium sulfate and concentrated under reduced pressure to give ethyl 3-(2-bromophenyl)-2-ethoxycarbonyl-3-methylpropionate.

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