Formic Acid → 1H-Purine-2,6-dione, 3,7-dihydro-3-cyclopropyl-
Reaktionsgleichung
[CH:1]1([N:4]2[C:9]([NH2:10])=[C:8]([NH2:11])[C:7](=[O:12])[NH:6][C:5]2=[O:13])[CH2:3][CH2:2]1.[CH:14](O)=O>>[CH:1]1([N:4]2[C:9]3[N:10]=[CH:14][NH:11][C:8]=3[C:7](=[O:12])[NH:6][C:5]2=[O:13])[CH2:3][CH2:2]1Komponenten
3
Versuchsvorschrift
A solution of 12 g of 1-cyclopropyl-5,6-diamino-2,4-(1H,3H)-pyrimidinedione (IV) in 50 ml of formic acid was refluxed for 2 hours. The hot solution was filtered and 30 ml of chloroform was added and ether was then added slowly. The received crystals were filtered off. Yield 11.2 g (V). The amide (V) was refluxed in 40 ml of 2N NaOH for 1 hour and then neutralized with 5N HCl. The crystals were filtered off. Yield 7 g (60%) (VI) NMR (see Table I). ##STR9##
Aufarbeitung
- filtrationThe hot solution was filtered
- addition30 ml of chloroform was added
- additionether was then added slowly
- filtration