Hydrochloric Acid → (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(3,3,5,5-tetramethylcyclohexylidene)methyl]phenyl}-2-propenoic acid

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Reaction Conditions

Reaction Steps

To a solution of Ethyl (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(3,3,5,5-tetramethylcyclohexylidene)methyl]phenyl}-2-propenoate (140) (0.235 g, 0.54 mmol) in a mixture of EtOH (6 mL) and THF (6 mL) was added an aqueous solution of 1 N NaOH (7 mL). The mixture was stirred at 60° C. for 2 h. Upon cooling, the mixture was acidified to pH=2 with an aqueous solution of 2 N HCl. The mixture was extracted with EtOAc (2×50 mL). The combined organic extract was washed with brine and dried over Na2SO4. Upon concentration and adding hexanes, compound 141 was obtained as pale yellow solid (0.182 g, 83%). mp 193-195° C. 1H NMR (400 MHz, DMSO-d6): δ 0.87 (s, 6H), 0.89 (s, 6H), 1.25 (s, 2H), 1.88 (s, 2H), 1.91 (s, 2H), 6.45 (d, J=15.9 Hz, 1H), 6.76 (dd, J1=8.2 Hz, J2=1.6 Hz, 1H), 6.80-6.92 (m, 2H), 7.17 (d, J=8.0 Hz, 2H), 7.53 (d, J=16.1 Hz, 1H), 7.59 (d, J=8.2 Hz, 2H), 9.72 (s, 1H), 12.32 (s, 1H). LCMS (ES): m/z 407 (M−H)−. Anal. Calcd for C26H29FO3.1/6H2O: C, 75.89; H, 7.19; Found: C, 75.91; H, 7.17.

Provenance & Evidence