Bromobenzene → N~2~,N~2~-Diethylquinazoline-2,4-diamine

HRID 1576325

Reaktionsgleichung

Reaktionsgleichung von HRID 1576325
BrC1C=CC=CC=1.[Li].[NH2:9][C:10]1[CH:17]=[CH:16][CH:15]=[CH:14][C:11]=1[C:12]#[N:13].[CH2:18]([N:20]([CH2:23][CH3:24])[C:21]#[N:22])[CH3:19]>O.C(OCC)C>[NH2:13][C:12]1[C:11]2[C:10](=[CH:17][CH:16]=[CH:15][CH:14]=2)[N:9]=[C:21]([N:20]([CH2:23][CH3:24])[CH2:18][CH3:19])[N:22]=1

Komponenten

7

Edukt 4

HCID 7961BromobenzeneHCID 12050DiethylcyanamideHCID 729132-AminobenzonitrileHCID 3028194Lithium

Produkt 1

HCID 345849N~2~,N~2~-Diethylquinazoline-2,4-diamine

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 962WaterLösungsmittelHCID 3283Diethyl EtherLösungsmittel3×

Versuchsvorschrift

Under a nitrogen atmosphere 4.7 g. (0.03 mol) of bromobenzene dissolved in 35 ml. of anhydrous diethyl ether, are added to 0.42 g. (0.06 mol) of lithium. To the solution obtained, a solution of 0.03 mol o-aminobenzonitrile in 15 ml. of anhydrous diethyl ether is added dropwise at room temperature. After about 10 minutes, a solution of 0.03 mol diethylcyanamide in 10 ml. of anhydrous diethyl ether is added dropwise. The reaction mixture is then refluxed under the nitrogen atmosphere for 4 hours. The next day the mixture is decomposed by addition of water. The ethereal layer is separated off, washed with water, dried over sodium sulphate and concentrated by evaporation of solvent. Some petroleum ether (boiling range 28°-40°C.) is added to the residue, the solid is filtered off and crystallized from a mixture of methanol and water. 4-Amino-2-diethylaminoquinazoline, m.p. 125°-128°C., is obtained.

Aufarbeitung

  1. customTo the solution obtained
  2. temperatureThe reaction mixture is then refluxed under the nitrogen atmosphere for 4 hours
  3. customThe ethereal layer is separated off
  4. washwashed with water
  5. dry with materialdried over sodium sulphate
  6. concentrationconcentrated by evaporation of solvent
  7. additionSome petroleum ether (boiling range 28°-40°C.) is added to the residue
  8. filtrationthe solid is filtered off
  9. customcrystallized from a mixture of methanol and water

Quellen und Nachweise

ORD-Eintrag
ord-912b0dca4fea47cb9ebad674654a8bc1
Quelldatensatz
uspto-grants-1976_09
Patentnummer
US03980650

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