Ethyl cyanoacetate → 2-Cyano-4,4-bis(ethoxycarbonyl)-3-methyl-4-phenyl-but-2-enoic acid ethyl ester

Beteiligte Stoffe

Reaktionsschritte

A mixture of diethyl 2-acetyl-2-phenylmalonate (50 mmol, Example 32, Part A), ethyl cyanoacetate (50 mmol), acetic acid (1.14 mL) ammonium acetate (400 mg), and benzene (50 mL) is heated to reflux in a Dean-Stark apparatus. After approximately 10 hours, additional ethyl cyanoacetate (50 mmol), acetic acid (1.14 mL), and ammonium acetate (400 mg) are added. After an additional 10 hours, the reaction is cooled to room temperature, diluted with ethyl acetate (30 mL), washed with water (240 mL), brine (40 mL), and dried (Na2SO4). After filtering, the extract is concentrated in vacuo and the desired product, as a mixture of E and Z-isomers, is isolated by column chromatography on silica gel, eluting with 5% ethyl acetate in petroleum ether.

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