Sulfuric Acid → HCID 69516013, compound

Participants

Reaction Conditions

Reaction Steps

5.3 g of 4-(3-fluorophenyl)-4-methyl-2-oxovaleric acid-ethyl ester in 60 ml of dimethylformamide is combined at 0° C. with 3.25 g of cesium carbonate and 4.63 ml of trifluoromethyl(trimethyl)-silane. After 1 hour at 0° C. and 16 hours at room temperature, it is cooled again to 0° C. and mixed with 20 ml of a 1 M tetrabutylammonium fluoride solution in tetrahydrofuran. After 30 minutes at 0° C., 2N sulfuric acid and ethyl acetate are added to it, the ethyl acetate phase is washed with water, dried (Na2SO4) and concentrated by evaporation. After chromatography on silica gel hexane-ethyl acetate (20:1) and bulb tube distillation, 4.45 g of 4-(3-fluorophenyl)-2-hydroxy-4-methyl-2-trifluoromethylvaleric acid-ethyl ester is obtained (boiling point 100° C./0.04 hPa).

Provenance & Evidence