Hydrochloric Acid → 2-(1-ethyl-1H-pyrazol-4-yl)-9-hydroxy-9-trifluoromethyl-9H-fluorene-4-carboxylic acid

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Reaction Conditions

Reaction Steps

Under an argon atmosphere, an optically active form (0.100 g) of 2-chloro-9-hydroxy-9-trifluoromethyl-9H-fluorene-4-carboxylic acid, 1-ethyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (0.133 g), tripotassium phosphate (0.191 g), palladium(II)acetate (0.0034 g), 2-dicyclohexylphosphino-2′,6′-dimethoxybiphenyl (0.0123 g), dioxane (3 ml) and water (0.6 ml) were mixed, and the mixture was stirred at 100° C. for 1 hr. The reaction mixture was cooled to room temperature, hydrochloric acid and ethyl acetate were added, and the mixture was partitioned in a separatory funnel. The organic layer was washed twice with water and once with saturated brine, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure, and the obtained residue was treated with hexane/ethyl acetate mixed solution (hexane:ethyl acetate=1:2,2 ml). This slurry was filtered, and the obtained solid was dried to give the title compound (0.075 g, 63%).

Provenance & Evidence