Acetic Anhydride → (3-Methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methanol

HRID 1645528Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1645528
[CH3:1][C:2]1[C:7]([CH3:8])=[C:6]([O:9][CH2:10][C:11]2([CH3:21])[O:20][CH2:19][C:14]3([O:18][CH2:17][CH2:16][O:15]3)[CH2:13][O:12]2)[CH:5]=[CH:4][N+:3]=1[O-].C(N(CC)CC)C.C(OC(=O)C)(=[O:32])C>>[CH3:8][C:7]1[C:2]([CH2:1][OH:32])=[N:3][CH:4]=[CH:5][C:6]=1[O:9][CH2:10][C:11]1([CH3:21])[O:20][CH2:19][C:14]2([O:18][CH2:17][CH2:16][O:15]2)[CH2:13][O:12]1

Komponenten

4

Edukt 3

HCID 7918Acetic AnhydrideHCID 8471TriethylamineHCID 597925822,3-Dimethyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridine 1-oxide

Produkt 1

HCID 59792595(3-Methyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridin-2-yl)methanolAusbeute 26,1 %

Reaktionsbedingungen

Temperatur
50 °C

Versuchsvorschrift

The 2,3-dimethyl-4-((8-methyl-1,4,7,9-tetraoxaspiro[4.5]dec-8-yl)methoxy)pyridine 1-oxide (1.20 g, 3.84 mmol) obtained in the step (5d) was mixed with acetic anhydride (10 ml). To the mixture, triethylamine (0.8 ml, 5.74 mmol) was added and the mixture was stirred at 50° C. for 2 hours. The reaction mixture was concentrated and methanol (10 ml) was added to the residue. Thereafter a 5N aqueous sodium hydroxide solution (7 ml) was added to the mixture, and stirred at room temperature for 30 minutes. To the resultant mixture, a saturated aqueous ammonium chloride solution (7 ml) was added and the pH was adjusted to about 10. The reaction mixture was diluted with ethyl acetate, and the organic layer was washed with a 2N aqueous sodium hydroxide solution, water, and a saline solution, dried over anhydrous sodium sulfate and concentrated. The obtained crude product was purified by silica gel column chromatography (elution solvent: ethyl acetate/methanol=1/0-4/1 gradient) and a desired fraction(s) was concentrated to obtain the title compound (312 mg, 26.1% yield) as a light yellow solid.

Aufarbeitung

  1. concentrationThe reaction mixture was concentrated
  2. additionmethanol (10 ml) was added to the residue
  3. additionThereafter a 5N aqueous sodium hydroxide solution (7 ml) was added to the mixture
  4. stirringstirred at room temperature for 30 minutes
  5. additionTo the resultant mixture, a saturated aqueous ammonium chloride solution (7 ml) was added
  6. additionThe reaction mixture was diluted with ethyl acetate
  7. washthe organic layer was washed with a 2N aqueous sodium hydroxide solution, water
  8. dry with materiala saline solution, dried over anhydrous sodium sulfate
  9. concentrationconcentrated
  10. customThe obtained crude product
  11. customwas purified by silica gel column chromatography (elution solvent: ethyl acetate/methanol=1/0-4/1 gradient)
  12. concentrationa desired fraction(s) was concentrated

Quellen und Nachweise

ORD-Eintrag
ord-b802cd18d1654eafa1033237ab196517
Quelldatensatz
uspto-grants-2012_02
Patentnummer
US08124780B2

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