Ethylene Glycol → 1-Bromo-3-(1,3-dioxolan-2-YL)-4-methoxybenzene

HRID 72584

Reaktionsgleichung

Reaktionsgleichung von HRID 72584
[Br:1][C:2]1[CH:3]=[CH:4][C:5]([O:10][CH3:11])=[C:6]([CH:9]=1)[CH:7]=[O:8].[CH2:12](O)[CH2:13][OH:14].O.C1(C)C=CC(S(O)(=O)=O)=CC=1>C1(C)C=CC=CC=1>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([O:10][CH3:11])=[C:6]([CH:7]2[O:14][CH2:13][CH2:12][O:8]2)[CH:9]=1

Komponenten

5

Edukt 3

HCID 174Ethylene GlycolHCID 906845-Bromo-2-methoxybenzaldehydeHCID 521998p-Toluenesulfonic acid monohydrate

Produkt 1

HCID 223495891-Bromo-3-(1,3-dioxolan-2-YL)-4-methoxybenzeneAusbeute 62,3 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 1140TolueneLösungsmittel

Versuchsvorschrift

To a stirred solution of 5-bromo-2-methoxybenzaldehyde (5.0 g, 23.25 mmol) in toluene (50 mL) was added ethylene glycol (2.6 mL, 46.5 mmol) and p-toluenesulfonic acid monohydrate (0.45 g, 2.32 mmol) and the reaction mixture was azeotroped for 2 h, quenched with sat. NaHCO3 (50 mL). Reaction mixture was concentrated under reduced pressure, extracted with ethyl acetate (2×100 mL), washed with water, brine, dried over sodium sulfate, concentrated and purified by silica gel column chromatography to furnish 2-(5-bromo-2-methoxy-phenyl)-[1,3]dioxolane (3.75 g).

Aufarbeitung

  1. customthe reaction mixture was azeotroped for 2 h
  2. customquenched with sat. NaHCO3 (50 mL)
  3. customReaction mixture
  4. concentrationwas concentrated under reduced pressure
  5. extractionextracted with ethyl acetate (2×100 mL)
  6. washwashed with water, brine
  7. dry with materialdried over sodium sulfate
  8. concentrationconcentrated
  9. custompurified by silica gel column chromatography

Quellen und Nachweise

ORD-Eintrag
ord-107b1be43fc44a18b54e16138cfe2a3a
Quelldatensatz
uspto-grants-2014_09
Patentnummer
US08828951B2

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