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

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Reaction Steps

1-{4-[(Ethylamino)carbonyl]phenyl}-5-isopropyl-1H-1,2,3-triazole-4-carboxylic acid (512 mg, 1.69 mmol) obtained in Example 92a), HOBt (116 mg, 0.847 mmol, 0.5 eq.) and cyclopropylamine (0.157 ml, 2.20 mmol, 1.3 eq.) were dissolved in acetonitrile-DMF (2:1, 9.0 ml), WSC (398 mg, 2.03 mmol, 1.2 eq.) was added, and the mixture was stirred at room temperature for 3 hr. The reaction mixture was concentrated, the residue was diluted with ethyl acetate-hexane (2:1, 45 ml), and the mixture was washed with 2% aqueous sodium carbonate solution, 10% aqueous ammonium chloride solution and saturated brine. The aqueous layers were each extracted with ethyl acetate-hexane (3:2, 30 ml). The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated, and diethyl ether was added to the residue. The precipitate was collected by filtration, washed with diethyl ether and dried to give the title compound as a white powder (476 mg, 1.39 mmol, 91.4%).

Provenance & Evidence