反应详情

9.39 g (39 mmol) of a freshly prepared solution of hydrogen chloride in ethanol (15.15 percent by weight) was added to 6.80 g (30 mmol) of N-(1-cyanocyclopentyl)-pentanamide (prepared from cyclopentanone by means of a Strecker synthesis to give 1-aminocyclopentanecarbonitrile and acylation with pentanoyl chloride, content 85.7 percent) in 28 g of anhydrous ethanol. The mixture was heated to 50° C. under nitrogen and stirred at this temperature for 3.1 hours. It was then cooled to 1° C. and left to stand at this temperature for 1 hour. The product which had precipitated out was filtered off, washed with 10 ml of ice-cold ethanol and dried at 40° C./24 mbar. The yield of the product was 4.05 g (58 percent) of colorless crystals, content 98.3 percent (HPLC).