Diethyl Ether → (E)-6,6-dimethyl-2-hepten-4-ynylmalonic acid dimethyl ester

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Reaction Steps

4.05 ml of malonic acid dimethyl ester is dissolved in 40 ml of dimethylformamide, 1.29 g of 60% oily sodium hydride and 6.5 g of (E)-6,6-dimethyl-2-hepten-4-ynyl bromide (containing about 5% Z-form) are added gradually, and the mixture is stirred at that temperature for 1 hour. Saturated saline and ethyl ether are added to the reaction solution to form two liquid phases, the ether layer is taken, washed with saturated saline and dried over anhydrous magnesium sulfate, and the solvent is distilled off under reduced pressure. The residue is purified by silica gel column chromatography [Wako gel C-200, 400 g; hexane/ethyl acetate=19/1→9/1] to obtain 6.26 g of (E)-6,6-dimethyl-2-hepten-4-ynylmalonic acid dimethyl ester as colorless oil.

Provenance & Evidence