Hydrochloric Acid → (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoic acid

HRID 229224Notes

Reaction equation

HRID 229224 reaction equation
[F:1][C:2]1[CH:3]=[C:4]([C:9](=[C:23]2[CH2:28][C:27]([CH3:30])([CH3:29])[O:26][C:25]([CH3:32])([CH3:31])[CH2:24]2)[C:10]2[CH:15]=[CH:14][C:13](/[CH:16]=[CH:17]/[C:18]([O:20]CC)=[O:19])=[CH:12][CH:11]=2)[CH:5]=[CH:6][C:7]=1[OH:8].[OH-].[Na+].Cl>CCO.C1COCC1>[F:1][C:2]1[CH:3]=[C:4]([C:9](=[C:23]2[CH2:24][C:25]([CH3:32])([CH3:31])[O:26][C:27]([CH3:30])([CH3:29])[CH2:28]2)[C:10]2[CH:11]=[CH:12][C:13](/[CH:16]=[CH:17]/[C:18]([OH:20])=[O:19])=[CH:14][CH:15]=2)[CH:5]=[CH:6][C:7]=1[OH:8]

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 68977829Ethyl (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoate

Product 1

HCID 11384323(2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoic acid

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
60 °C

Procedure

To a solution of ethyl (2E)-3-{4-[(3-fluoro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoate (137) (0.30 g, 0.68 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, the title compound 138 was obtained as an off-white solid (0.227 g, 81%). mp 125-128° C. 1H NMR (400 MHz, DMSO-d6): δ 1.10 (s, 6H), 1.12 (s, 6H), 2.10 (s, 2H), 2.14 (s, 2H), 6.47 (d, J=15.9 Hz, 1H), 6.75-6.80 (m, 1H), 6.82-6.95 (m, 2H), 7.19 (d, J=8.2 Hz, 2H), 7.54 (d, J=15.9 Hz, 1H), 7.61 (d, J=8.2 Hz, 2H), 9.80 (s, 1H), 12.36 (s, 1H). LCMS (ES): m/z 409 (M−H)−. Anal. Calcd for C25H27FO4.0.4H2O: C, 71.89; H, 6.71; Found: C, 71.88; H, 6.92.

Workup

  1. temperatureUpon cooling
  2. extractionThe mixture was extracted with EtOAc (2×50 mL)
  3. extractionThe combined organic extract
  4. washwas washed with brine
  5. dry with materialdried over Na2SO4
  6. concentrationUpon concentration
  7. additionadding hexanes

Sources & evidence

ORD record
ord-ffdf742398ad4c43a5c658cd711d48a3
Source dataset
uspto-grants-2009_07
Patent number
US07560589B2

Reaction notes

Loading…