Lithium Hydroxide → (E)-2-Fluoro-3-[4-(2-n-propoxy-3,5-di-iso-propylphenyl)-benzo[b]thien-2-yl]-prop-2-enoic acid

HRID 1394611Notes

Reaction equation

HRID 1394611 reaction equation
C([O:3][C:4](=[O:33])[C:5]([F:32])=[CH:6][C:7]1[S:11][C:10]2[CH:12]=[CH:13][CH:14]=[C:15]([C:16]3[CH:21]=[C:20]([CH:22]([CH3:24])[CH3:23])[CH:19]=[C:18]([CH:25]([CH3:27])[CH3:26])[C:17]=3[O:28][CH2:29][CH2:30][CH3:31])[C:9]=2[CH:8]=1)C.C1COCC1.[Li+].[OH-]>CO>[F:32]/[C:5](=[CH:6]/[C:7]1[S:11][C:10]2[CH:12]=[CH:13][CH:14]=[C:15]([C:16]3[CH:21]=[C:20]([CH:22]([CH3:23])[CH3:24])[CH:19]=[C:18]([CH:25]([CH3:26])[CH3:27])[C:17]=3[O:28][CH2:29][CH2:30][CH3:31])[C:9]=2[CH:8]=1)/[C:4]([OH:33])=[O:3]

Participants

5

Reactant 3

HCID 3939Lithium HydroxideHCID 8028TetrahydrofuranHCID 69220376HCID 69220376, compound

Product 1

HCID 69218075(E)-2-Fluoro-3-[4-(2-n-propoxy-3,5-di-iso-propylphenyl)-benzo[b]thien-2-yl]-prop-2-enoic acid

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A mixture of 0.450 mmol of 2-fluoro-3-[4-(2-n-propoxy-3,5-di-iso-propylphenyl)-benzo[b]thien-2-yl]-prop-2-enoic acid ethyl ester, 3 mL of THF, 3 mL of methanol and 1 mL of LiOH (2N aqueous) was refluxed for 2 hours. After cooling at room temperature, the mixture was acidified to pH=2 and extracted with ethyl acetate. The organic layer was dried over MgSO4 and after evaporation of the solvents, the crude acid was recrystallized from acetonitrile. (E)-2-Fluoro-3-[4-(2-n-propoxy-3,5-di-iso-propylphenyl)-benzo[b]thien-2-yl]-prop-2-enoic acid was isolated as a white solid. 1H-NMR (CDCl3), δ: 7.83 (d, J=7.7 Hz, 1H), 7.49 (broad s, 1H), 7.46 (s, 1H), 7.42 (t, J=7.0 Hz, 2H), 7.18 (d, J=2.1 Hz, 1H), 7.00 (d, J=2.1 Hz, 1H), 3.42 (dt, J=13.7, 6.8 Hz, 1H), 3.32 (m, 1H), 3.19 (m, 1H), 2.92 (dt, J=13.8, 6.9 Hz, 1H), 1.29 (m, 14H), 1.22 (m, 2H), 0.45 (t, J=7.3 Hz, 3H).

Workup

  1. temperaturewas refluxed for 2 hours
  2. extractionextracted with ethyl acetate
  3. dry with materialThe organic layer was dried over MgSO4
  4. customafter evaporation of the solvents
  5. customthe crude acid was recrystallized from acetonitrile

Sources & evidence

ORD record
ord-14af9ba2feb5495e860e6e6c95c67632
Source dataset
uspto-grants-2008_03
Patent number
US07348359B2

Reaction notes

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