Ethylamine → HCID 69337829, compound

Participants

Reaction Steps

15.0 g 4-benzyl-4-dimethylamino-cyclohexanone (see example 3) were dissolved in 225 ml analytical grade tetrahydrofuran, and 2.89 g ethylamine followed by 8.40 ml glacial acetic acid were added, while stirring in an ice-bath. 19.2 g sodium triacetoxyborohydride were then added in portions in the course of 15 minutes and the mixture was subsequently stirred overnight. For working up, 110 ml two molar sodium hydroxide solution were added dropwise (pH>10) and the mixture was extracted three times with 200 ml diethyl ether each time. The combined organic phases were washed twice with 200 ml water each time, dried over sodium sulfate and filtered and the filtrate was concentrated. The crude product obtained (15.7 g) was chromatographed over silica gel with methanol with the addition of one percent by volume of aqueous ammonia solution (25 wt. %). 14.1 g of the still significantly contaminated product were obtained, and were chromatographed again over silica gel with methanol with the addition of one percent by volume of aqueous ammonia solution (25 wt. %). 12.1 g 1-benzyl-N′-ethyl-N,N-dimethyl-cyclohexane-1,4-diamine were obtained as a cis/trans mixture.

Provenance & Evidence