Sodium Hydroxide → 2,2-difluoroethyl-4-(2,5-dimethyl-1H-pyrrol-1-yl)cyclopent-2-ene-1-carboxylic acid

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Reaction Steps

A solution of methyl (1S,4S)-1-(2,2-difluoroethyl)-4-(2,5-dimethyl-1H-pyrrol-1-yl)cyclopent-2-ene-1-carboxylate (7.54 g, 26.6 mmol) in methanol (60 ml) was treated with 2.5 N NaOH (15 ml, 37.5 mmol) and stirred at room temperature for 22 hours. The methanol was removed under reduced pressure and the residue partitioned between diethyl ether and water. The layers were separated and the aqueous was acidified with 4 N HCl, extracted with ethyl acetate, washed with brine, dried over MgSO4, and concentrated under reduced pressure to give (1S,4S)-1-(2,2-difluoroethyl-4-(2,5-dimethyl-1H-pyrrol-1-yl)cyclopent-2-ene-1-carboxylic acid as a brown oil (6.59 g, 92%). 1NMR (400 MHz, CDCl3) δ ppm 6.12-6.09 (1H), 6.07-6.05 (0.25H), 5.99-5.96 (1H), 5.93-5.91 (0.5H), 5.79-5.76 (0.25H), 5.74 (2H), 5.38-5.32 (1H), 2.54-2.46 (2H), 2.43-2.25 (2H), 2.20 (6H).

Provenance & Evidence