Dichloromethane → 2-Benzoyl-1-cyano-5,7-dibenzyloxy-1,2-dihydroisoquinoline

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Reaction Steps

A solution of 3 g of potassium cyanide in 15 ml of water is added to 25 ml of a methylene chloride solution containing 3.3 g of 5,7-dibenzyloxyisoquinoline. 6.4 g of benzoyl chloride are added to the mixture at 0° C for 2 hours under stirring. After the mixture is allowed to stand at room temperature, the methylene chloride layer is separated therefrom. The methylene chloride solution separated is washed with an aqueous 1% sodium hydroxide solution and water, respectively. The methylene chloride solution is then dried and evaporated to remove solvent. The oily residue thus obtained is dissolved in 10 ml of ether, and this solution is poured onto a silica gel column. The column is eluted with a mixture of ether and hexane. The eluate is evaporated to remove solvent, and the crystalline residue thus obtained is recrystallized from ethanol. 4 g of 2-benzoyl-1-cyano-5,7-dibenzyloxy-1,2-dihydroisoquinoline are thereby obtained. Yield: 64% M.p. 123° - 125° C.

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