Sodium Hydroxide → 2-Methyl-6-oxo-4-(4-(trifluoromethyl)phenyl)-1,4,5,6-tetrahydropyridine-3-carboxylic acid

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Reaction Steps

The product from Step 1 (1.00 g, 3.34 mmol, 1.00 equiv) was dissolved in MeOH (11 mL). Following addition of 2.5N NaOH (4 mL), the reaction mixture was heated to reflux for 8 hours. The reaction mixture was diluted with water and extracted with ethyl acetate. The organic phase was washed again with 1N NaOH. The aqueous phases were combined and acidified to pH˜1 with 5N HCl, and extracted twice with ethyl acetate. The combined organic extracts were washed with satd. NaCl, dried over Na2SO4, and filtered. The filtrate was concentrated en vacuo and azeotroped several times with hexanes. The resulting white solid was triturated with Et2O to afford 146 mg (15%) of the acid as an off-white solid. MS (ES+) m/e 266 [M+H]+.

Provenance & Evidence