Water → 4-Hydroxy-2-(6-methoxycarbonyl-3-hexynyl)-2-cyclopentenone

Participants

Reaction Conditions

Reaction Steps

To the compound [VIII-1] (28.3 g, 0.12 mole) are added water (1200 g) and acetic acid (1.5 g), and the pH value thereof is adjusted to pH 4.4 with 5% aqueous sodium hydroxide solution. The mixture is heated with stirring at 100° C. for 25 hours. After completion of the reaction, the reaction solution is cooled and extracted twice with methyl isobutyl ketone (300 ml) and separated. Methyl isobutyl ketone is distilled off from the organic layer to give a mixture (21.5 g, yield; 76%) of 4-hydroxy-2-(6-methoxycarbonyl-3-hexynyl)-2-cyclopentenone (racemic 4-hydroxycyclopentenone) and 3-hydroxy-2-(6-methoxycarbonyl-3-hexynyl)-2-cyclopentenone [IX-1] (ratio thereof=6:4).

Provenance & Evidence