2,4-Dichlorobenzyl chloride → HCID 131723333, compound

Participants

Reaction Steps

0.38 g (15.6 mmole) of magnesium turnings was stirred in 10 ml of ether of analysis purity. 3.04 g (15.6 mmole) of 2,4-dichlorobenzyl chloride 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. 3.0 g (13.0 mmole) of the 2-(dimethylaminophenylmethyl)cyclohexanone prepared according to Example 1 were dissolved in 15 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 30 ml of saturated ammonium chloride solution while cooling in an ice bath, and was extracted three times at RT, each time with 60 ml of ethyl acetate. The combined organic extracts were dried over sodium sulfate, filtered, and concentrated by evaporation on a rotary evaporator (500 to 10 mbar). 2.14 g of crude base (97.0% of theory) were obtained, from which a hydrochloride was precipitated according to Example 1 (3rd stage) with chlorotrimethylsilane/water in 2-butanone. The base was freed from the hydrochloride with 20 ml of water and 3 ml of caustic soda (32 m %), extracted three times, each time with 20 ml of ether, and the combined organic extracts were dried over sodium sulfate, filtered, and concentrated by evaporation on a rotary evaporator (500 to 10 mbar). 1.19 g of crude base were obtained, from which 0.45 g of 1-(2,4-dichlorobenzyl)-2-(dimethylaminophenylmethyl)cyclohexanol, hydrochloride (8.1% of theory) was obtained according to the procedure described in Example 1 (3rd stage) with chlorotri-methylsilane/water in 2-butanone. The hydrochloride decomposes on heating above 140° C.

Provenance & Evidence