Potassium Hydroxide → HCID 59997883, compound

Participants

Reaction Conditions

Reaction Steps

from methyl methyl-6-[(1R,3S)-3-(5-methyl-2-p-tolyloxazol-4-ylmethoxy)-cyclohexyloxymethyl]benzoate: 97.1 g (165 mmol) of methyl methyl-6-[(1R,3S)-3-(5-methyl-2-p-tolyloxazol-4-ylmethoxy)cyclohexyloxymethyl]benzoate are dissolved in a mixture of 640 ml of isopropanol and 80 ml of water. 47.7 g (809 mmol) of potassium hydroxide are added in portions. The reaction is stirred at 95° C. for 24 hours. Subsequently, the solvent is removed fully under reduced pressure and the residue is taken up in 800 ml of tert-butyl methyl ether and 800 ml of water. Addition of hydrochloric acid (2 M) acidifies the mixture. After phase separation, the organic phase is washed four times with 200 ml each time of water. The organic phase is concentrated under reduced pressure and the residue is stirred with a little diisopropyl ether. The solid is filtered and dried under reduced pressure. 2-methyl-6-[(1R,3S)-3-(5-methyl-2-p-tolyloxazol-4-ylmethoxy)-cyclohexyloxymethyl]benzoic acid is obtained in 57% yield as a crystalline solid.

Provenance & Evidence