1-Hydroxybenzotriazole → Ethyl 3-[[5-[4-(9H-9-carbazolyl)-1-(3,4-dimethoxybenzoyl)-1,2,3,4-tetrahydro-2-quinolinyl]pentanoyl]amino]propionate

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Reaction Steps

5-[4-(9H-9-Carbazolyl)-1-(3,4-dimethoxybenzoyl)-1,2,3,4-tetrahydro-2-quinolinyl]-pentanoic acid (0.50 g, 0.89 mmol) prepared in Example 128 was mixed with β-alanine ethyl ester hydrochloride (0.15 g, 1 mmol), N,N-dimethylformamide (10 ml), 1-hydroxybenzotriazole (0.14 g, 1 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (WSC) (0.19 g, 1 mmol), followed by stirring overnight at room temperature. After distilling off the solvent, the residue was partitioned between ethyl acetate and saturated brine, washed and dried over anhydrous magnesium sulfate. After distilling off the solvent, the residue was applied to silica gel column chromatography (developing solvent: ethyl acetate/hexane=1/7) to give the titled compound (0.48 g, yield: 81%) as a white powder (cis:trans=3:1).

Provenance & Evidence