Acetaldehyde → 4H-Pyrrolo2,1-d-1,3,5-dithiazine, tetrahydro-2,4-dimethyl-, 2S-(2alpha,4alpha,8abeta)-

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Reaction Steps

44 g (1 mol) of acetaldehyde are added dropwise to a solution of 34.5 g (0.5 mol) of 1-pyrroline in 150 ml of ether. Hydrogen sulphide is then passed into the reaction mixture, while the latter is cooled with ice, until saturation is reached. After 10 g of magnesium sulphate have been added, the reaction mixture is kept at room temperature for 15 hours. When the ether has been removed by distillation, the residue is fractionally distilled. 43 g of 2,4-dimethyltetrahydropyrrolo[2.1-d]-[1,3,5]-dithiazine (boiling point at 6 mbar: 105° C.) are obtained.

Provenance & Evidence