Triethylamine → trans-N-Methyl-N-[2-(1-pyrrolidinyl)-cyclohexyl]-4,5-dichloro-2-thienylacetic acid amide hydrochloride

Beteiligte Stoffe

Reaktionsschritte

A solution of 1,61 g (7,01 mmoles) of 4,5-dichloro-2-thienylacetic acid chloride (formula (II); X=4-Cl, Y=5-Cl, Z=Cl) in 15 ml of absolute chloroform is dropped to a solution of 1,24 g (6,80 mmoles) of trans-N-methyl-2-(1-pyrrolidinyl)cyclohexylamine (formula III; R=methyl, ##STR7## and 0,69 g (6,80 mmoles) of triethylamine in 60 ml of absolute chloroform for 15 minutes at room temperature and then stirred 18 hours at room temperature. Thereafter the reaction solution is shaken out with saturated solution of sodium hydrogen carbonate, the organic phase is washed with water, dried over sodium sulfate and evaporated. The oily residue consisting of the crude base of formula (I) and some ether-insoluble by-product is taken up with 30 ml of ether, filtered over activated charcoal and HCl-gas is introduced into the solution. The precipitated crystalline hydrochloride is sucked off, dissolved in 4 ml of methanol, precipitated with 50 ml of wet ether, sucked off and the operation is repeated once. The colorless crystals are dried at 13,3 Pa and room temperature for 5 hours. Thus the non-hygroscopic hemihydrate of the hydrochloride is obtained. Yield 57%. M.p. 216°-218° C. The compound free of crystal water obtained by drying in vacuo at 13,3 Pa and 140° C. is hygroscopic.

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