Bromine → Ethyl 2-methoxyimino-3,3-ethylenedioxy-4-bromobutyrate

HRID 1702037Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1702037
[Br:1]Br.[CH3:3][O:4][N:5]=[C:6]([C:12]1([O:17][CH2:16][CH2:15][O:14]1)[CH3:13])[C:7]([O:9][CH2:10][CH3:11])=[O:8].S([O-])([O-])(=O)=S.[Na+].[Na+]>C(Cl)(Cl)Cl>[CH3:3][O:4][N:5]=[C:6]([C:12]1([O:14][CH2:15][CH2:16][O:17]1)[CH2:13][Br:1])[C:7]([O:9][CH2:10][CH3:11])=[O:8]

Komponenten

5

Edukt 3

HCID 24408BromineHCID 24477Sodium ThiosulfateHCID 54382027Ethyl 2-methoxyimino-3,3-ethylenedioxybutyrate

Produkt 1

HCID 53760491Ethyl 2-methoxyimino-3,3-ethylenedioxy-4-bromobutyrate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6212ChloroformLösungsmittel2×

Versuchsvorschrift

A solution of bromine (14.72 g) in chloroform (30 ml) was added to a stirred solution of ethyl 2-methoxyimino-3,3-ethylenedioxybutyrate (syn isomer, 20 g) in chloroform (200 ml) at ambient temperature and stirred at the same temperature for an hour. To the resultant solution was added 5% sodium thiosulfate aqueous solution (100 ml) and stirred at ambient temperature for 10 minutes. The organic layer was separated, washed with 5% sodium thiosulfate aqueous solution (100 ml), water (100 ml), a sodium bicarbonate saturated aqueous solution and sodium chloride saturated solution in turn and then dried over magnesium sulfate. The solution was evaporated in vacuo and the remaining oil (33.4 g) was distilled under reduced pressure to give an oil of ethyl 2-methoxyimino-3,3-ethylenedioxy-4-bromobutyrate (syn isomer), bp 0.95 mm/Hg 115°-118° C. (Yield: quantitative).

Aufarbeitung

  1. stirringstirred at ambient temperature for 10 minutes
  2. customThe organic layer was separated
  3. washwashed with 5% sodium thiosulfate aqueous solution (100 ml), water (100 ml)
  4. dry with materiala sodium bicarbonate saturated aqueous solution and sodium chloride saturated solution in turn and then dried over magnesium sulfate
  5. customThe solution was evaporated in vacuo
  6. distillationthe remaining oil (33.4 g) was distilled under reduced pressure

Quellen und Nachweise

ORD-Eintrag
ord-71819e38dcdf41a4a0b64c46d9c56d99
Quelldatensatz
uspto-grants-1983_04
Patentnummer
US04379922

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