5-Chloro-2-furaldehyde → 1-(5-Chloro-furfurylidene-amino)-2,3-dioxo-piperazine
Reaktionsgleichung
[Cl:1][C:2]1[O:8][C:5]([CH:6]=O)=[CH:4][CH:3]=1.[NH2:9][N:10]1[CH2:15][CH2:14][NH:13][C:12](=[O:16])[C:11]1=[O:17]>C(O)(=O)C>[Cl:1][C:2]1[O:8][C:5]([CH:6]=[N:9][N:10]2[CH2:15][CH2:14][NH:13][C:12](=[O:16])[C:11]2=[O:17])=[CH:4][CH:3]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
1.6 pts. by wt. of 5-chloro-furfural, 1.3 pts. by wt. of 1-amino-2,3-dioxo-piperazine and 7 pts. by vol. of glacial acetic acid are warmed to 90° C. for 10 minutes and then left for 30 minutes at RT. The precipitate is filtered off, washed first with 3 pts. by vol. of glacial acetic acid and then twice with 10 pts. by vol. of acetonitrile each time and dried in air. 1.8 pts. by wt. (74.6%) of 1-(5-chloro-furfurylidene-amino)-2,3-dioxo-piperazine are obtained as yellowish crystals of decomp. pt. 233°-6° C.