Diphosgene → 5-(2-Nitrophenyl)-1,3,4-oxadiazol-2(3H)-one

HRID 378967

Reaktionsgleichung

Reaktionsgleichung von HRID 378967
[N+:1]([C:4]1[CH:13]=[CH:12][CH:11]=[CH:10][C:5]=1[C:6]([NH:8][NH2:9])=[O:7])([O-:3])=[O:2].Cl[C:15](OC(Cl)(Cl)Cl)=[O:16]>O1CCOCC1>[N+:1]([C:4]1[CH:13]=[CH:12][CH:11]=[CH:10][C:5]=1[C:6]1[O:7][C:15](=[O:16])[NH:9][N:8]=1)([O-:3])=[O:2]

Komponenten

4

Edukt 2

HCID 10426DiphosgeneHCID 3781218o-Nitrobenzohydrazide

Produkt 1

HCID 3129215-(2-Nitrophenyl)-1,3,4-oxadiazol-2(3H)-oneAusbeute 86,3 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 312751,4-DioxaneLösungsmittel2×

Versuchsvorschrift

A solution of 2-nitrobenzoylhydrazine (9.05 g, 0.05 mol) in dioxane (30 mL) was slowly added to a solution of trichloromethyl chloroformate (4.6 mL, 0.04 mol) in dioxane (30 mL) at room temperature. On completion of the addition the reaction was heated to reflux for 4 hours. The solvent was evaporated off and the residue re-crystallised from 96%. ethanol (50 mL) to give 7.15 g of the 5-(2-nitrophenyl)-3H-[1,3,4]oxadiazol -2-one. M.p. 157-158° C. A solution of the nitro compound (2 g, 9.7 mmol) in 96% ethanol (25 mL) was hydrogenated over 5% palladium on charcoal to give desired 1.6 g of the desired amine.

Aufarbeitung

  1. additionOn completion of the addition the reaction
  2. temperaturewas heated
  3. temperatureto reflux for 4 hours
  4. customThe solvent was evaporated off
  5. customthe residue re-crystallised from 96%

Quellen und Nachweise

ORD-Eintrag
ord-0225d23dafec42378aeac7dae7b594a0
Quelldatensatz
uspto-grants-2001_10
Patentnummer
US06297261B1

Verknüpfte Notizen

Wird geladen…