Chloroacetonitrile → 2-Benzyl-5-cyanomethyl-2,5-diazabicyclo[2.2.1]heptane

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Finely ground potassium carbonate, as well as 1.3 mL of freshly distilled chloroacetonitrile were added to a solution of 3 g of 2-benzyl-2,5-diazabicyclo[2.2.1]heptane in 40 mL of anhydrous toluene and refluxed for 10 hours with vigorous stirring. The solution was cooled, filtered and evaporated. Bulb tube distillation (boiling point: 110°–120° C. at 0.01 mbar) resulted in 3.57 g of 140 as a colorless oil (97% of the theoretical yield).

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