2-Chlorobenzaldehyde → [2-(2-Thienyl)ethylamino](2-chlorophenyl)acetonitrile

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Reaction Conditions

Reaction Steps

104 g (1 mol) of sodium bisulfite is dissolved in the mixture of 900 ml of water and 250 ml of ethanol and to the solution 140.6 g (1 mol) o-chlorobenzaldehyde is added. After a few minutes the aldehyde bisulfite adduct precipitates in the form of white crystals, while the temperature raises to 40° C. After 1 hour of stirring 127.2 g (1 mol) of 2-(2-thienyl)ethylamine is added to the reaction mixture, then it was stirred at 50° C. for 2 hours. During this time the crystalline aldehyde bisulfite transforms into an oily material. The mixture is cooled to room temperature and the solution of 49 g (1 mol) of sodium cyanide in 100 ml of water is added to it. During the addition the temperature of the reaction mixture raises to 40° C. The mixture is then stirred at 60° C. till the reaction is completed (1 hour). The oily organic phase is then extracted with 400 ml of 1,2-dichloroethane, washed to cyanide-free with 2×200 ml of water, traces of 2-(2-thienyl)ethylamine are removed by treatment with 100 ml of 3% hydrochloric acid solution. The dichloroethane phase was dried over anhydrous sodium sulfate and evaporated in vacuo. The residual fast crystallizing oil is the product. Weight: 260 g (94%) mp.: 40-41° C. The product was identified by elementary analysis, IR spectrum and 1H-NMR investigation.

Provenance & Evidence