Boron tribromide → (E)-methyl 3-(4-((6-hydroxy-2-(4-hydroxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate

HRID 632686Notes

Reaction equation

HRID 632686 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][CH3:23])=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:24]3[CH:29]=[CH:28][C:27]([O:30]C)=[CH:26][CH:25]=3)[S:8][C:7]=2[CH:32]=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]([O:22][CH3:23])=[O:21])=[CH:14][CH:13]=3)=[C:9]([C:24]3[CH:25]=[CH:26][C:27]([OH:30])=[CH:28][CH:29]=3)[S:8][C:7]=2[CH:32]=1

Participants

4

Reactant 2

HCID 25134Boron tribromideHCID 86730659(E)-methyl 3-(4-((6-methoxy-2-(4-methoxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate

Product 1

HCID 86730677(E)-methyl 3-(4-((6-hydroxy-2-(4-hydroxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylateYield 13.6%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a 30 mL vial containing (E)-methyl 3-(4-((6-methoxy-2-(4-methoxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate (100 mg, 0.22 mmol) in DCM (1 mL) was added BBr3 (1 M in heptane, 0.224 mL, 0.22 mmol) and the reaction was stirred for 1 h at room temperature. The reaction mixture was quenched with 4 mL MeOH and stirred for 10 min at room temperature. The crude material was concentrated onto silica gel and purified by column chromatography (SiO2, 1-100% EtOAc/Heptane) to afford (E)-methyl 3-(4-((6-hydroxy-2-(4-hydroxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate (11 mg, 0.03 mmol, 12% yield), and a mixture of (E)-methyl 3-(4-((2-(4-hydroxyphenyl)-6-methoxybenzo[b]thiophen-3-yl)oxy)phenyl)acrylate and (E)-methyl 3-(4-((6-hydroxy-2-(4-methoxyphenyl)benzo[b]thiophen-3-yl)oxy)phenyl)acrylate (32 mg, 0.07 mmol, 33% yield). LC/MS (m/z, MH+): 433.2.

Workup

  1. customThe reaction mixture was quenched with 4 mL MeOH
  2. stirringstirred for 10 min at room temperature
  3. concentrationThe crude material was concentrated onto silica gel
  4. custompurified by column chromatography (SiO2, 1-100% EtOAc/Heptane)

Sources & evidence

ORD record
ord-d37e373059d84cb7934f5c869997dc14
Source dataset
uspto-grants-2016_04
Patent number
US09321746B2

Reaction notes

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