Triethylamine → 2-(4-{1-Ethyl-1-[4-(1-hydroxy-cyclopentylethynyl)-3-methyl-phenyl]-propyl}-2-methyl-benzoylamino)-2-methyl-propionic acid methyl ester

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Reaction Steps

4-{1-Ethyl-1-[4-(1-hydroxy-cyclopentylethynyl)-3-methyl-phenyl]-propyl}-2-methyl-benzoic acid (389 mg, 0.962 mmol), α-aminoisobutyric acid methyl ester hydrochloride (221 mg, 1.44 mmol), 1-(3-dimethyl-aminopropyl)-3-ethylcarbodiimide hydrochloride (276 mg, 1.44 mmol), 1-hydroxybenzotriazole hydrate (195 mg, 1.44 mmol) and triethylamine (536 μL, 3.85 mmol) are stirred overnight. The reaction is concentrated and partitioned between EtOAc (150 ml) and 1N HCl (50 ml). The aqueous layer is extracted with EtOAc (100 ml). The combined organic layers are washed with, water (50 ml), NaHCO3 (50 ml), brine (50 ml), dried (anhydrous MgSO4), concentrated and chromatographed (12 g SiO2, 15% EtOAc/Hexanes) to yield the title compound (398 mg, 82%).

Provenance & Evidence