Hydrochloric Acid → 4-[4-(3,5-dichloro-phenyl)-4-trifluoromethyl-3,4-dihydro-2H-pyrrol-2-yl]-2-methyl-benzoic acid

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Reaction Steps

To a solution of 4-[4-(3,5-dichloro-phenyl)-4-trifluoromethyl-3,4-dihydro-2H-pyrrol-2-yl]-2-methyl-benzoic acid ethyl ester (Example 10.5) (2.8 g) in ethanol (40 ml) was added a solution of sodium hydroxide (0.51 g) in water (15 ml). The reaction mixture was stirred at reflux for 1 hour. After cooling to ambient temperature aqueous hydrochloric acid (1M) (20 ml), water (150 ml) and ethyl acetate (200 ml) was added. The phases were separated and the organic phase was washed with brine, dried over sodium sulfate and concentrated. The residue was recrystallised from diisopropyl ether to give 4-[4-(3,5-dichloro-phenyl)-4-trifluoromethyl-3,4-dihydro-2H-pyrrol-2-yl]-2-methyl-benzoic acid (2.02 g) as a white solid. 1H-NMR (d6-DMSO, 400 MHz): 13.07 (s, 1H), 7.91-7.58 (m, 6H), 4.85 (d, 1H), 4.44 (d, 1H), 3.92-3.35 (m, 2H), 2.58 (s, 3H) ppm.

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