Citric Acid → N-(4-(3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl)-5-methyl[1,2,4]triazol-3-ylmethyl)naphthalene-2-caboxamide

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Reaction Steps

3-Aminomethyl-4-(3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl)-5-methyl[1,2,4]triazole di-p-toluenesulfonate (3.70 g) was dissolved in dimethylformamide (20 ml). Naphthalene-2-carboxylic acid (0.95 g) and diphenylphosphoryl azide (1.29 ml) were added under ice-cooling and dissolved in the solution. A solution of triethylamine (2.24 ml) in dimethylformamide was dropwise added, and the mixture was allowed to stand overnight at room temperature. Then, a 10% aqueous citric acid solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous sodium hydrogencarbonate solution and saturated brine, and dried over magnesium sulfate. The solvent was evaporated, and the residue was recrystallized from ethyl acetate to give 0.53 g of N-(4-(3-(2-chlorobenzoyl)-5-ethylthiophen-2-yl)-5-methyl[1,2,4]triazol-3-ylmethyl)naphthalene-2-caboxamide.

Provenance & Evidence