Lithium hydroxide, monohydrate → 4-{4-[4-(3,3-Dimethyl-butyl)-piperazin-1-yl]-4-oxo-butyl}-3-methyl-benzoic Acid

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Reaction Steps

Lithium hydroxide monohydrate (108 mg, 2.6 mmol) was added to a solution of 4-{4-[4-(3,3-dimethyl-butyl)-piperazin-1-yl]-4-oxo-butyl}-3-methyl-benzoic acid methyl ester from Example E43.1 (500 mg, 1.3 mmol) in THF (12 ml) and water (6 ml). The mixture was stirred for 20 h at room temperature then solvents were removed in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 2% acetic acid:4% methanol:94% dichloromethane) then recrystallised from chloroform and pet. ether to yield the title compound (439 mg, 91%).

Provenance & Evidence