Hydrochloric Acid → HCID 25056059, compound

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Reaction Steps

Under an argon stream, to a suspension of the compound (46 mg) obtained in Example 10, 1,2,3,4,5-pentaphenyl-1′-(di-tert-butylphosphino)ferrocene (5 mg) and bis(dibenzylideneacetone)palladium(0) (4 mg) in tetrahydrofuran was added, with stirring under ice-cooling, 0.5M 4-ethoxy-4-oxobutylzinc bromide/tetrahydrofuran solution (422 μl). After stirring at room temperature for 24 hr, 1N aqueous hydrochloric acid solution was added, and the mixture was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate, filtrated and concentrated under reduced pressure. Methanol (0.5 ml) was added to the residue, and 4N aqueous sodium hydroxide solution (35 μl) was added with stirring under ice-cooling. After stirring at room temperature for 3 hr, 2N aqueous hydrochloric acid solution (70 μl) was added, and the mixture was concentrated under reduced pressure. The residue was purified by thin layer chromatography (chloroform:methanol:acetic acid=90:10:1) and recrystallized from water-containing methanol to give the title compound (2.4 mg).

Provenance & Evidence