Reaktion #7731

Reaktionsgleichung

oxalacetic acid diethyl ester

guanidine carbonate

→

2-Amino-6-oxo-1,6-dihydro-pyrimidine-4-carboxylic acid ethyl ester

Lösungsmittel

water

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturunder reflux for 2 hours
2. 2
   Einengenconcentrated
3. 3
   Sonstigeto removed ethanol
4. 4
   Filtrationthe solid was collected by filtration
5. 5
   Temperaturconcentrated hydrochloric acid (1 mL) and refluxed for 15 minutes
6. 6
   TemperaturThe mixture was then cooled
7. 7
   workup.ADDITIONdiluted with water
8. 8
   Einengenconcentrated
9. 9
   Sonstigeto removed ethanol
10. 10
    FiltrationThe white solid was collected by filtration and vacuum
11. 11
    Sonstigedried
12. 12
    Sonstigeto give J1.1 (1.67 g, 20%)

Vorschrift

A solution of oxalacetic acid diethyl ester (8.5 g, 45.2 mmol) in ethanol (100 mL) was treated with guanidine carbonate (8.1 g, 45.2 mmol) and this was stirred under reflux for 2 hours. The mixture was diluted with water, concentrated to removed ethanol, and the solid was collected by filtration. The solid was then suspended in ethanol (40 mL) and concentrated hydrochloric acid (1 mL) and refluxed for 15 minutes. The mixture was then cooled, basified with potassium carbonate, diluted with water and concentrated to removed ethanol. The white solid was collected by filtration and vacuum dried to give J1.1 (1.67 g, 20%). 1H-NMR (DMSO-d6) δ: 10.34 (1H, br s), 8.92 (1H, br s), 7.46 (1H, br, s), 5.42 (1H, s), 4.18 (2H, q, J=7 Hz), 1.24 (3H, t, J=7 Hz).

Quelle