Triethylamine → methyl (2S)-2-[(3-{(2R)-2-[2-(3-chlorophenyl)-(2R)-2-hydroxyethylamino]propyl}-1H-indole-7-carbonyl)amino]-4-methyl-pentanoate

Participants

Reaction Steps

A solution of 3-{(2R)-2-[2-(3-chlorophenyl)-(2R)-2-hydroxyethyl-amino]propyl}-1H-indole-7-carboxylic acid (22 mg, 0.059 mmol), L-Leu-OMe.HCl (107 mg, 0.59 mmol), 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride (113 mg, 0.59 mmol), 1-hydroxybenztriazole (80 mg, 0.59 mmol), triethylamine (164 μL, 1.18 mmol) in dimethylformamide (2 mL) is stirred at room temperature for 18 hours. The mixture is diluted with ethyl acetate, washed with a saturated aqueous sodium hydrogen carbonate solution, water, and a saturated brine, dried over sodium sulfate, and concentrated. The residue is purified by silica gel column chromatography (a saturated ammonia solution in chloroform) and preparative reversed phase HPLC (octadecylsilyl, trifluoroacetic acid/acetonitrile/water) to give the desired methyl (2S)-2-[(3-{(2R)-2-[2-(3-chlorophenyl)-(2R)-2-hydroxyethylamino]propyl}-1H-indole-7-carbonyl)amino]-4-methylpentanoate.trifluoroacetate (23 mg, yield: 63%).

Provenance & Evidence