Lithium Hydroxide → 2-Chloro-4-(3-methyl-1H-pyrazol-1-yl)benzoic acid

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Reaction Steps

A solution of 2-chloro-4-(3-methyl-1H-pyrazol-1-yl)-benzoic acid methyl ester (1,42 g) from Example 96 and 6 ml of 1 M aqueous lithium hydroxide in tetrahydrofuran (20 ml) was stirred for 18 hours at room temperature. The reaction mixture was partitioned between ethyl acetate and 1 N hydrochloric acid. The organic layer was washed with water, brine and was dried over anhydrous sodium sulfate. Evaporation of the solvent in vacuo afforded 1.05 g of the title compound as a colorless solid. m.p. 192-193° C. MS (EI), m/z: 236/238 (M)+.

Provenance & Evidence