Hydrochloric Acid → 2-({4-[Cycloheptylidene(4-hydroxyphenyl)methyl]phenyl}oxy)-2-methylpropanoic acid

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Reaction Steps

The hydrolysis procedure described for 191 was employed. Ethyl 2-({4-[cycloheptylidene(4-hydroxyphenyl)methyl]phenyl}oxy)-2-methylpropanoate (225) (0.150 g, 0.37 mmol) was dissolved in THF and EtOH (1:1, 6 mL) and then treated with 1 N NaOH (3 mL, excess) at 70° C. for 1 h. The reaction mixture was cooled and poured into 20% aqueous HCl (40 mL). Standard work-up and purification afforded 0.105 g (75%) of the title compound 226 as an off-white solid. 1H NMR (300 MHz, DMSO-d6): δ 13.06 (br s, 1H), 9.26 (s, 1H), 6.98 (d, J=8.4 Hz, 2H), 6.90 (d, J=7.8 Hz, 2H), 6.72 (d, J=8.4 Hz, 2H), 6.67 (d, J=8.1 Hz, 2H), 2.21 (br s, 4H), 1.52 (br s, 8H), 1.48 (s, 6H). LCMS (ESI): m/z 379 (M−H)−. Anal. Calcd for C24H28O4, C, 75.76; H, 7.42; Found: C, 75.07, H, 7.52.

Provenance & Evidence