Sulfuric Acid → HCID 20089256, compound

Participants

Reaction Steps

4.35 g (0.0665 At-g) of activated zinc are covered with 12 ml of dimethoxymethane, and then 1 ml (9 mmol) of pure ethyl bromoacetate is added under an argon atmosphere. After induction of the reaction by heating, a solution of 6.38 ml (57.5 mmol) of ethyl bromoacetate in 20 ml of dimethoxymethane is added in such a manner as to maintain reflux. After the zinc has been completely consumed and the reaction mixture has returned to room temperature, a solution of 11.1 g (43.5 mmol) of 3-acetyl-6-phenyl-2H-chromene in 60 ml of anhydrous tetrahydrofuran is added dropwise over a period of from 10 to 15 minutes. After one hour's stirring at room temperature, the mixture, cooled to +4° C., is treated with 25 ml of a 10% sulphuric acid solution. After addition of 70 ml of diethyl ether, the aqueous phase is separated off, and the ethereal phase is washed with 3×20 ml of water and then dried over magnesium sulphate. The solvents are evaporated off under reduced pressure, yielding a solid which is used in the following step without additional purification.

Provenance & Evidence