Hydrochloric Acid → methyl 2-(4-ethoxy-3-[(2S,3S,4R,5R,6R)-3,4,5-tris(acetyloxy)-6-[(acetyloxy)methyl]tetrahydro-2H-pyran-2-yl]benzyl)azulene-1-carboxylate

HRID 1375992Notes

Reaction equation

HRID 1375992 reaction equation
[C:1]([O:4][C@@H:5]1[C@@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@@H:8]([CH2:19][O:20][C:21](=[O:23])[CH3:22])[O:7][C@H:6]1[C:24]1[CH:29]=[C:28]([CH2:30]Br)[CH:27]=[CH:26][C:25]=1[O:32][CH2:33][CH3:34])(=[O:3])[CH3:2].Cl[C:36]1[CH:45]=[C:44]2[C:38](=[CH:39][CH:40]=[CH:41][CH:42]=[CH:43]2)[C:37]=1[C:46]([O:48][CH3:49])=[O:47].Cl>BrCCBr.C1COCC1.Cl[Si](C)(C)C.[Zn]>[CH2:33]([O:32][C:25]1[CH:26]=[CH:27][C:28]([CH2:30][C:36]2[CH:45]=[C:44]3[C:38](=[CH:39][CH:40]=[CH:41][CH:42]=[CH:43]3)[C:37]=2[C:46]([O:48][CH3:49])=[O:47])=[CH:29][C:24]=1[C@H:6]1[C@H:5]([O:4][C:1](=[O:3])[CH3:2])[C@@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@H:9]([O:15][C:16](=[O:18])[CH3:17])[C@@H:8]([CH2:19][O:20][C:21](=[O:23])[CH3:22])[O:7]1)[CH3:34]

Participants

8

Reactant 3

HCID 313Hydrochloric AcidHCID 22107186Methyl 2-chloroazulene-1-carboxylateHCID 58786161(1S)-2,3,4,6-tetra-O-acetyl-1,5-anhydro-1-[5-(bromomethyl)-2-ethoxyphenyl]-D-glucitol

Product 1

HCID 58786173methyl 2-(4-ethoxy-3-[(2S,3S,4R,5R,6R)-3,4,5-tris(acetyloxy)-6-[(acetyloxy)methyl]tetrahydro-2H-pyran-2-yl]benzyl)azulene-1-carboxylateYield 70.2%

Reagents, catalysts & solvents 4

HCID 6397ChlorotrimethylsilaneCatalystHCID 78391,2-DibromoethaneCatalystHCID 23994ZincCatalystHCID 8028TetrahydrofuranSolvent

Procedure

Two drops of 1,2-dibromoethane was added to a suspension of zinc powder (0.17 g) in THF (5.0 ml) in an argon atmosphere and the mixture was refluxed with heating for five minutes. After cooling to room temperature, two drops of chlorotrimethylsilane was added to the reaction mixture. The mixture was stirred for 15 minutes. Next, (1S)-2,3,4,6-tetra-O-acetyl-1,5-anhydro-1-[5-(bromomethyl)-2-ethoxyphenyl]-D-glucitol (1.4 g) was added to the reaction mixture and the mixture was refluxed with heating for one hour. After cooling to room temperature, tetrakistriphenylphosphine palladium (0) (0.27 g) and methyl 2-chloroazulene-1-carboxylate (0.28 g) were added to the reaction mixture. The mixture was refluxed with heating for six hours. After cooling to room temperature, the reaction mixture was poured into 10% aqueous solution of hydrochloric acid under cooling with ice. The mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated. The residue was purified by silica gel column chromatography (n-hexane-ethyl acetate) to obtain methyl 2-(4-ethoxy-3-[(2S,3S,4R,5R,6R)-3,4,5-tris(acetyloxy)-6-[(acetyloxy)methyl]tetrahydro-2H-pyran-2-yl]benzyl)azulene-1-carboxylate (0.58 g).

Workup

  1. temperaturethe mixture was refluxed
  2. temperaturewith heating for five minutes
  3. temperaturethe mixture was refluxed
  4. temperaturewith heating for one hour
  5. temperatureAfter cooling to room temperature
  6. temperatureThe mixture was refluxed
  7. temperaturewith heating for six hours
  8. temperatureAfter cooling to room temperature
  9. temperatureunder cooling with ice
  10. extractionThe mixture was extracted with ethyl acetate
  11. washThe organic layer was washed with saturated brine
  12. dry with materialdried over anhydrous sodium sulfate
  13. filtrationAfter filtration
  14. concentrationthe filtrate was concentrated
  15. customThe residue was purified by silica gel column chromatography (n-hexane-ethyl acetate)

Sources & evidence

ORD record
ord-28f24438b21c40c880c04899f9383ed6
Source dataset
uspto-grants-2007_01
Patent number
US07169761B2

Reaction notes

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