Hydrochloric Acid → (1RS,2RS)-1-hydroxy-2-methyl-5-oxo-2-phenylcyclohexane-1-carboxylic acid

참여 물질

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반응 단계

3.5 cm3 (39 mmol) of methyl vinyl ketone and 72 cm3 (71.5 mmol) of a normal aqueous sodium hydroxide solution were successively added to a solution, cooled to the region of 7° C., of 6.7 g (32.5 mmol) of ethyl(RS)-2-oxo-3-phenylbutyrate in 68 cm3 of ethanol and then the reaction mixture was stirred at a temperature in the region of 20° C. for two hours. The reaction mixture was cooled to 15° C. and 72 cm3 of a normal aqueous hydrochloric acid solution were added. After concentrating the ethanol, the precipitate formed was filtered off, washed with water and then dried at 50° C. 4.4 g (50%) of (1 RS,2RS)-1-hydroxy-2-methyl-5-oxo-2-phenylcyclohexane-1-carboxylic acid were thus obtained in the form of a beige powder, the characteristics of which were as follows:

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