Ammonia → HCID 67195176, compound

Participants

Reaction Steps

A solution of dicyclohexylamine (3.9 mL, 19 mmol) and triethylamine (6 mL, 43 mmol) in THF (64 mL) was added dropwise to a stirred solution of triphosgene (1.99 g, 6.7 mmol) in THF (35 mL) at room temperature. The reaction mixture was stirred overnight. Then, a solution of dicyclohexylamine (3.9 mL, 18 mmol) and triethylamine (6 mL, 43 mmol) in THF (37 mL) was added. The reaction mixture was stirred overnight at reflux temperature. The reaction mixture was filtered and the filtrate was evaporated to dryness, yielding tetracyclohexylurea as a yellow solid. Yield: 4.5 g (65%). A solution of oxalyl chloride in dichloromethane (1.1 mL, 13 mmol) was added to a stirred solution of the urea (4.5 g, 11 mmol) in THF (50 mL). The reaction mixture was evaporated to dryness after overnight heating to reflux. A solution of ammonia in methanol (5 mL, 35 mmol, 7 M) was added to a solution of the formed solid in THF (40 mL). The reaction mixture was heated to reflux overnight and evaporated to dryness. The product was neutralized and treated with aqueous sodium hydroxide solution. The organic layer was extracted with diethyl ether and dried over magnesium sulfate. Crystallization from hexanes yielded the desired guanidine as a brown solid. Yield: 2.9 g (64%). 13C NMR (CDCl3, 75 MHz): δ 25.4, 26.2, 31.8, 58.0, 156.2 ppm.

Provenance & Evidence