1-Methylpiperazine → HCID 53680343, compound

Participants

Reaction Steps

A mixture of 8.0 g (0.015 mole) of 1-[2-(o-chlorobenzoyl)-4-chlorophenyl]-5-(iodomethyl)-1H-1,2,4-triazole-3-carboxylic acid methyl ester [see Example 13(b)] and 3.3 ml of 1-methyl-piperazine in 160 ml of methanol is stirred for 16 hours at 40°. The reaction solution is then concentrated in vacuo; water is added to the residue and extraction is performed twice with methylene chloride. The organic phase is washed twice with ice water, and extraction is then performed twice with 2 N hydrochloric acid solution. To the aqueous acidified extracts there are added ice and sufficient 5 N sodium hydroxide solution to bring the pH-value to 10. The base that has precipitated is taken up in ether. The organic phase is washed twice with saturated sodium chloride solution; it is afterwards dried over sodium sulphate and concentrated in vacuo to dryness. There is obtained 1-[2-(o-chlorobenzoyl)-4-chlorophenyl]-5-[(4-methyl-1-piperazinyl)-methyl]-1H-1,2,4-triazole-3-carboxylic acid methyl ester as solidified foam.

Provenance & Evidence