反应详情

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.

1. concentrationThe reaction solution is then concentrated in vacuo
2. additionwater is added to the residue and extraction
3. washThe organic phase is washed twice with ice water, and extraction
4. additionare added ice and sufficient 5 N sodium hydroxide solution
5. customThe base that has precipitated
6. washThe organic phase is washed twice with saturated sodium chloride solution
7. dry with materialit is afterwards dried over sodium sulphate
8. concentrationconcentrated in vacuo to dryness