Hydrochloric Acid → HCID 20333008, compound

Participants

Reaction Steps

6.8 ml of 33% ethanolic dimethylamine solution is added to a solution of 5.6 g (about 0.015 mole) of 1-[2-(α-hydroxybenzyl)-4-chlorophenyl]-5-(chloromethyl)-1H-1,2,4-triazole-3-carboxamide and 0.225 g of sodium iodide in 80 ml of methanol, and the whole is refluxed for 5 hours with stirring. The reaction mixtute is thereupon concentrated in vacuo. Water and saturated sodium carbonate solution are added to the residue until the pH-value has reached 10, and extraction is performed twice with ethyl acetate. The organic phase is washed with water, and is then extracted three times with 1N hydrochloric acid solution. Sodium carbonate is added to the aqueous acidified extracts until the pH-value of 10 is obtained. The base that has precipitated is taken up in ether; the ether solution is washed twice with water and once with saturated sodium chloride solution; it is dried over sodium sulphate and concentrated in vacuo to yield amorphous 1-[2-(α-hydroxybenzyl)-4-chlorophenyl]-5-[(dimethylamino)-methyl]- 1H-1,2,4-triazole-3-carboxamide. This is converted as follows into the crystalline hydrochloride: the crude base is dissolved in ethyl acetate, and ethereal hydrogen chloride solution is added until the pH-value is 4. The precipitated hydrochloride is filtered off with suction and washed with ethyl acetate and ether. After drying in vacuum, there is obtained 1-[2-(α-hydroxybenzyl) 4-chlorophenyl]-5-[(dimethylamino)-methyl]-1H-1,2,4-triazole-3-carboxamide-hydrochloride, m.p. 155°-157° (with decomposition).

Provenance & Evidence