1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → N-cyclopropyl-1-(4-{[(2-piperidin-1-ylethyl)amino]carbonyl}phenyl)-5-propyl-1H-1,2,3-triazole-4-carboxamide

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Reaction Steps

1-(4-{[(2-Piperidin-1-ylethyl)amino]carbonyl}phenyl)-5-propyl-1H-1,2,3-triazole-4-carboxylic acid (650 mg, 1.52 mmol) obtained in Example 62b), HOBt (104 mg, 0.759 mmol, 0.5 eq.) and cyclopropylamine (0.152 ml, 2.12 mmol, 1.4 eq.) were dissolved in acetonitrile-DMF (1:1, 10 ml), WSC (386 mg, 1.97 mmol, 1.3 eq.) was added, and the mixture was stirred at room temperature for 61 hr. The reaction mixture was concentrated, dissolved in ethyl acetate (35 ml) and washed sequentially with 2% aqueous sodium carbonate solution-saturated brine (1:1, 40 ml×2, 1:4, 40 ml×1). The aqueous layers were each extracted with ethyl acetate (30 ml). The organic layers were combined and dried over anhydrous sodium sulfate and concentrated, the residue was dissolved in toluene, and the solution was subjected to column chromatography on NH silica gel (Fuji Silysia Chemical Ltd., 100-200 mesh, DM1020, 6 g). The flow-through solution and the fraction obtained by elution with ethyl acetate-hexane (1:1-2:1) were concentrated, and ethyl acetate and diethyl ether were added. The precipitate was collected by filtration, washed with diethyl ether and dried to give the title compound as a white powder (408 mg, 0.961 mmol, 63.2%).

Provenance & Evidence