Selenious Acid → Potassium Hydroxide

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Starting materials suitable for the manufacture of the compounds of this invention are styrylglyoxal, conveniently prepared by the selenous acid oxidation of 4-phenyl-3-buten-2-one, and the dialkyl esters of 3-oxoundecane-1,11 -dioic acid. Dimethyl 3-oxoundecane-1,11-dioate is thus saponified with potassium hydroxide and the resulting dicarboxylic acid is allowed to react with styrylglyoxal, thus affording 14-phenyl-9,12-dioxo-11-hydroxytetradec-13-enoic acid. Cyclization of the latter intermediate in the presence of potassium hydroxide results in the instant 3-hydroxy-5-oxo-2-styrylcyclopent-1-eneheptanoic acid.

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