Lithium hydroxide, monohydrate → 4-[2-(4-Cyclobutylmethyl-piperazin-1-yl)-2-oxo-ethyl]-3-methyl-benzoic Acid

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Reaction Steps

Lithium hydroxide monohydrate (122 mg, 2.9 mmol) was added to a solution of 4-[2-(4-cyclobutylmethyl-piperazin-1-yl)-2-oxo-ethyl]-3-methyl-benzoic acid methyl ester from Example E85.1 (500 mg, 1.4 mmol) in THF (10 ml) and water (5 ml). The mixture was stirred for 20 h at room temperature and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 3% acetic acid:7% methanol:90% chloroform) to yield the title compound (300 mg, 63%).

Provenance & Evidence