Ammonium Chloride → HCID 131723345, compound

Participants

Reaction Steps

0.29 g (11.9 mmole) of magnesium turnings was stirred in 5 ml of ether of analysis purity. 2.47 g (11.9 mmole) of 2,4-difluorobenzyl bromide dissolved in 10 ml of ether were added dropwise so that the reaction mixture boiled gently. After completion of the addition the reaction mixture was stirred for a further hour at RT. 2.30 g (9.9 mmole) of the 2-(dimethylaminophenylmethyl)cyclohexanone prepared according to Example 1 were dissolved in 10 ml of ether, added dropwise to the Grignard reagent while cooling in an ice bath, and stirred for 15 hours at RT. The reaction mixture was worked up by adding 10 ml of saturated ammonium chloride solution while cooling in an ice bath, and extracted three times at RT with 15 ml of ether each time. The combined organic extracts were dried over sodium sulfate, filtered, and concentrated by evaporation on a rotary evaporator (500 to 10 mbar). 1.78 g of crude base (49.9% of theory) were obtained. The aqueous solution was extracted three times with 15 ml of ether and 15 ml of dichloromethane each time. The combined organic extracts were dried over sodium sulfate, filtered, and concentrated by evaporation on a rotary evaporator (500 to 10 mbar). 1.31 g of crude base (36.7% of theory) were obtained. The hydrochloride was precipitated from both bases according to Example 1 (3rd stage) with chlorotrimethylsilane/water in 2-butanone. 0.95 g of 1-(2,4-difluorobenzyl)-2-(dimethylaminophenylmethyl)cyclohexanol, hydrochloride (20.2% of theory) was obtained from the first base, and 1.27 g of 1-(2,4-difluorobenzyl)-2-(dimethylaminophenylmethyl)cyclohexanol, hydrochloride (32.4% of theory) with a melting point of 178° C. was obtained from the second base.

Provenance & Evidence