HCID 19004289, compound → HCID 54558282, compound

Participants

Reaction Steps

A solution of rac-2,2-dimethylbutanoic acid[3-methyl-2-[3-(2-tetrahydropyranyloxy)-1-propynyl]phenyl]methyl ester (1.2 g) in methanol (50 mL) was hydrogenated over 10% palladium on carbon (0.2 g) at room temperature and ambient pressure for 90 minutes. After the catalyst was removed by filtration through Celite, the methanol was removed in vacuo to give 1.2 g of rac-2,2-dimethylbutanoic acid [2-[3-(2-tetrahydropyranyloxy)-1-propyl]-3-methylphenyl]methyl ester as an oil. A solution of the oil (1.2 g) and pyridinium p-toluenesulfonate (0.1 g) in ethanol (25 mL) was stirred and heated in an oil bath maintained at 55° C. After 6 hours, the solvent was evaporated and the residue was partitioned between diethyl ether and water. The aqueous phase was extracted with diethyl ether, then the combined organic extracts were dried (Na2SO4) and evaporated to furnish 1 g of an oil. The material was purified by HPLC (diethyl ether-hexane; 1:9) to give 0.72 g of 2,2-dimethylbutanoic acid [2-(3-hydroxy-1-propyl)-3-methylphenyl]methyl ester.

Provenance & Evidence