Hydrochloric Acid → HCID 86673132, compound

Participants

Reaction Conditions

Reaction Steps

To a solution, cooled to 2-5°C. on an ice bath, of 1.88 g (22.41 mmol) of cyanoacetamide in 20 mL of anhydrous DMF are added portionwise 1.8 g (44.82 mmol) of 60% sodium hydride. The mixture is stirred for 15 minutes at 2-5°C., and this suspension is then added rapidly to a solution of 5.2 g (21.34 mmol) of the acid fluoride prepared in step 3.2 in 20 mL of anhydrous DMF precooled to 2-5°C. The mixture is stirred overnight at room temperature and then cooled to 2-5°C. on an ice bath, and 0.90 g (22.41 mmol) of 60% sodium hydride is added portionwise. The reaction mixture is stirred for 3 hours at room temperature and then poured into a mixture of ice, 100 mL of water and 150 mL of aqueous 1N HCl. The yellow precipitate formed is isolated by filtration, rinsed with water and then dried in an oven, after which it is rinsed with pentane. 5.4 g of a mixture containing the expected cyclized product and the non-cyclized product are finally obtained in the form of an orange powder. The mixture is purified by chromatography on a column of silica, eluting with a dichloromethane/methanol gradient (99/1 to 96/4). 0.6 g of the expected product is finally obtained in the form of a pale yellow solid. Yield=9%.

Provenance & Evidence