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

HRID 229218Notes

Reaction equation

HRID 229218 reaction equation
[Cl: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>[Cl: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 68975585Ethyl (2E)-3-{4-[(3-chloro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoate

Product 1

HCID 11750683(2E)-3-{4-[(3-Chloro-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-chloro-4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-propenoate (131) (0.32 g, 0.70 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 132 was obtained as a white powder (0.255 g, 85%). mp 118-121° C. 1H NMR (400 MHz, DMSO-d6): δ 1.10 (s, 6H), 1.12 (s, 6H), 2.11 (s, 2H), 2.13 (s, 2H), 6.47 (d, J=15.9 Hz, 1H), 6.85-7.00 (m, 2H), 7.08 (d, J=1.8 Hz, 1H), 7.19 (d, J=8.2 Hz, 2H), 7.54 (d, J=15.9 Hz, 1H), 7.62 (d, J=8.2 Hz, 2H), 10.15 (s, 1H), 12.36 (s, 1H). LCMS (ESI): m/z 425 (M−H)−. Anal. Calcd for C25H27ClO4.0.2H2O: C, 69.74; H, 6.41; Found: C, 69.82; H, 6.56.

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-bdf55ef1c9c4455c8f9ab7ac3178d6b4
Source dataset
uspto-grants-2009_07
Patent number
US07560589B2

Reaction notes

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