4-Methylpiperazine-1-ethylamine → 2-[3,5-bis(2-hydroxy-phenyl)-[1,2,4]triazol-1-yl]-N-[2-(4-methylpiperazin-1-yl)ethyl]acetamide

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Reaction Steps

3 g of ethyl [3,5-bis(2-hydroxyphenyl)-[1,2,4]triazol-1-yl]acetate (Example 2) and 2.5 g of 2-(4-methylpiperazin-1-yl)ethylamine are boiled under reflux for 20 h in 40 ml of ethanol. The mixture is cooled, poured onto water and extracted with ethyl acetate. The combined organic phases are dried over sodium sulfate and concentrated on a rotary evaporator. The residue is chromatographed on silica gel. After concentration and drying, 2-[3,5-bis(2-hydroxy-phenyl)-[1,2,4]triazol-1-yl]-N-[2-(4-methylpiperazin-1-yl)ethyl]acetamide is obtained as a colorless foam. Rfvalue: 0.17 (silica gel 60, methylene chloride/methanol=9/1). 1H-NMR (DMSO-d6): 2.1 (s, 3H), 2.3 (m, 10H), 3.15 (m, 2H), 4.9 (s, 2H), 7.0 (m, 4H), 7.4 (m, 3H), 8.0 (m, 2H), 11.0 ppm (s, 1H).

Provenance & Evidence