Hydrochloric Acid → 3-(4'-Chloro-6-fluoro-4-methyl-biphenyl-3-yl)-4-hydroxy-8-methoxy-1,8-diazaspiro[4.5]dec-3-en-2-one

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Reaction Steps

To a suspension of 3-(5-bromo-4-fluoro-2-methyl-phenyl)-4-hydroxy-8-methoxy-1,8-diaza-spiro[4.5]dec-3-en-2-one (230 mg) in dimethoxyethane (10 ml) under nitrogen atmosphere is added tetrakis(triphenylphosphine)palladium(0) (35 mg) and the mixture stirred at room temperature for 15 minutes. After further addition of water (2 ml), 4-chlorophenylboronic acid (112 mg) and sodium carbonate (250 mg), the mixture is heated at reflux for 8 hours. The reaction mixture is acidified at room temperature with 1N hydrochloric acid and extracted with ethyl acetate (3×). The combined organic layers are washed with brine, dried over sodium sulfate and concentrated. The residue is purified by chromatography on silica gel (ethyl acetate/cyclohexane 5:1). Yield: 170 mg of 3-(4′-chloro-6-fluoro-4-methyl-biphenyl-3-yl)-4-hydroxy-8-methoxy-1,8-diaza-spiro[4.5]dec-3-en-2-one (compound C24) as a solid.

Provenance & Evidence