Boron tribromide → (E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acid

HRID 332892Notes

Reaction equation

HRID 332892 reaction equation
C[O:2][C:3]1[CH:4]=[CH:5][C:6]2[C:10]([O:11][C:12]3[CH:17]=[CH:16][C:15](/[CH:18]=[CH:19]/[C:20]([O:22]C(C)(C)C)=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:27]3[CH:32]=[CH:31][C:30]([C:33]([F:36])([F:35])[F:34])=[CH:29][CH:28]=3)[S:8][C:7]=2[CH:37]=1.B(Br)(Br)Br>C(Cl)Cl>[OH:2][C:3]1[CH:4]=[CH:5][C:6]2[C:10]([O:11][C:12]3[CH:17]=[CH:16][C:15](/[CH:18]=[CH:19]/[C:20]([OH:22])=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:27]3[CH:32]=[CH:31][C:30]([C:33]([F:36])([F:34])[F:35])=[CH:29][CH:28]=3)[S:8][C:7]=2[CH:37]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 86730641(E)-tert-butyl 3-(4-((6-methoxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3 yl)oxy)phenyl)acrylate

Product 1

HCID 78322700(E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acidYield 66%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

To a 2-dram vial containing (E)-tert-butyl 3-(4-((6-methoxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3 yl)oxy)phenyl)acrylate (59.4 mg, 0.113 mmol) in anhydrous DCM (1.5 mL) at 0° C. was added BBr3 (1.0 M in DCM, 451 μL, 0.451 mmol) dropwise. The resulting mixture was stirred at 0° C. for 1 h after which the reaction was quenched with 3 drops of water, diluted with DCM, and extracted with sat. aq. NaHCO3 (added a few drops of 2-propanol). The organic layer was dried over anhydrous MgSO4, filtered concentrated in vacuo to afford the crude material which was purified by reverse phase HPLC (neutral condition, 3% 1-propanol in 10-100% CH3CN/H2O) to afford (E)-3-(4-((6-hydroxy-2-(4-(trifluoromethyl)phenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylic acid (33.8 mg, 0.074 mmol, 66% yield) as a white solid. 1H NMR (400 MHz, CD3OD) δ ppm=6.36 (d, J=16.17 Hz, 1H), 6.78-6.89 (m, 1H), 6.98 (d, J=8.59 Hz, 2H), 7.17-7.30 (m, 2H), 7.51-7.70 (m, 5H), 7.88 (d, J=8.08 Hz, 2H). HRMS (m/z, MH+): 457.0710.

Workup

  1. customwas quenched with 3 drops of water
  2. additiondiluted with DCM
  3. extractionextracted with sat. aq. NaHCO3 (added a few drops of 2-propanol)
  4. dry with materialThe organic layer was dried over anhydrous MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customto afford the crude material which
  8. customwas purified by reverse phase HPLC (neutral condition, 3% 1-propanol in 10-100% CH3CN/H2O)

Sources & evidence

ORD record
ord-c34edcd3f34e4888b726932a6f942e58
Source dataset
uspto-grants-2014_11
Patent number
US08877801B2

Reaction notes

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