Triethylamine → Lomerizine Hydrochloride

Participants

Reaction Steps

1.3 g (6.0 millimoles) of 2,3,4-trimethoxybenzyl chloride [see Monatsh., 95 (3), 942 (1964)], 1.7 g (5.9 millimoles) of bis(4-fluorophenyl)methylpiperazine and 1.2 ml (8.6 millimoles) of triethylamine were heated under reflux for 6 hours in 50 ml of benzene. The reaction mixture was allowed to cool to room temperature, washed with water, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure. A mixture of 2 ml of conc. hydrochloric acid and 20 ml of ethanol was added to the resulting oily product, and the mixture was concentrated under reduced pressure. Ether was added, and the precipitated crystals were collected by filtration. Recrystallization of the crystals from ethanol-ether gave 1.6 g of 1-(2,3,4-trimethoxybenzyl)-4-[bis(4-fluorophenyl)methyl]piperazine dihydrochloride as colorless crystals. The product showed the same property values as the compound obtained in Example 4.

Provenance & Evidence