Selenium Dioxide → HCID 22048258, compound

HRID 1833235Notes

Reaction equation

HRID 1833235 reaction equation
[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([CH:26]=[CH:27][CH:28]=1)[CH2:7][C:8]1[C:17]2[C:12](=[CH:13][C:14]([O:20][CH2:21][CH2:22][Br:23])=[C:15]([O:18][CH3:19])[CH:16]=2)[C:11]([CH:24]=[O:25])=[CH:10][N:9]=1)[CH3:2].[Se](=O)=[O:30].C(OCC)(=O)C.CCCCCC>C(O)(=O)C>[CH2:1]([O:3][C:4]1[CH:5]=[C:6]([CH:26]=[CH:27][CH:28]=1)[C:7]([C:8]1[C:17]2[C:12](=[CH:13][C:14]([O:20][CH2:21][CH2:22][Br:23])=[C:15]([O:18][CH3:19])[CH:16]=2)[C:11]([CH:24]=[O:25])=[CH:10][N:9]=1)=[O:30])[CH3:2]

Participants

5

Reactant 3

HCID 24007Selenium DioxideHCID 21226206Ethyl acetate hexaneHCID 22048425HCID 22048425, compound

Product 1

HCID 22048258HCID 22048258, compound

Reagents, catalysts & solvents 1

HCID 176Acetic AcidSolvent

Conditions

Temperature
120 °C

Procedure

To a stirred solution of 6-hydroxy-7-methoxy-1-(3-ethoxy-benzyl)-isoquinoline-4-carbaldehyde (90 mg, 0.25 mmol) in N,N-dimethylformamide (2 mL) was added potassium carbonate (352 mg, 2.50 mmol) and 1,2-dibromoethane (0.129 μL, 1.25 mmol) at room temperature. The reaction mixture was heated 85° C. for 2 hrs. The solvent was evaporated and the residue was purified on a flash chromatography (Merck Silica gel 60, 70–230 mesh, 50% ethyl acetate/hexane) to afford product 1-(3-ethoxy-benzyl)-6-(2-bromo-ethoxy)-7-methoxy-isoquinoline-4-carbaldehyde as a colorless oil. The crude product was used without further purification. To a stirred solution of 1-(3-ethoxy-benzyl)-6-(2-bromo-ethoxy)-7-methoxy-isoquinoline-4-carbaldehyde in acetic acid (2 mL) was added selenium dioxide (278 mg, 2.50 mmol). The reaction mixture was heated at 120° C. for 1 hr. The solvent was evaporated and the residue was diluted with dichloromethane (30 mL). The organic layer was washed with saturated aqueous sodium bicarbonate solution (20 mL), saturated aqueous sodium chloride solution (20 μL), dried over anhydrous magnesium sulfate, filtered and concentrated in vacuo to afford a crude oil. Flash chromatography (Merck Silica gel 60, 70–230 mesh, 40% ethyl acetate/hexane) afforded 1-(3-ethoxy-benzoyl)-6-(2-bromo-ethoxy)-7-methoxy-isoquinoline-4-carbaldehyde as a major product (80 mg, 100% yield).

Workup

  1. customThe crude product was used without further purification
  2. customThe solvent was evaporated
  3. additionthe residue was diluted with dichloromethane (30 mL)
  4. washThe organic layer was washed with saturated aqueous sodium bicarbonate solution (20 mL), saturated aqueous sodium chloride solution (20 μL)
  5. dry with materialdried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customto afford a crude oil

Sources & evidence

ORD record
ord-ae53cad008ac4ae8a09fa900ae8d61f9
Source dataset
uspto-grants-2006_06
Patent number
US07067529B2

Reaction notes

Loading…