Diethanolamine → 2-[3,5-bis(2-hydroxyphenyl)-[1,2,4]triazol-1-yl]-N,N-bis(2-hydroxyethyl)acetamide

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Reaction Steps

2.0 g of ethyl [3,5-bis(2-hydroxyphenyl)-[1,2,4]triazol-1-yl]acetate (Example 2) and 6.5 g of diethanolamine are boiled under reflux for 2 h in 5 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-hydroxyphenyl)-[1,2,4]triazol-1-yl]-N,N-bis(2-hydroxyethyl)acetamide is obtained as a colorless foam. Rf value: 0.28 (silica gel 60, methylene chloride/methanol=9/1). 1H-NMR (DMSO-d6): 3,2-3,6 (m, 8H) 4.4-5.1 (b, 2H), 5.35 (s, 2H), 7.0 (m, 4H), 7.4 (m. 3H), 7.95 (d, 1H), 10.4 (bs, 1H), 11.05 ppm (s, 1H).

Provenance & Evidence