Diethyl acetylenedicarboxylate → HCID 54442780, Verbindung
Reaktionsgleichung
[NH2:1][C:2]1[S:3][CH:4]=[C:5]([C:7]2[CH:12]=[CH:11][C:10]([CH2:13][CH3:14])=[CH:9][CH:8]=2)[N:6]=1.[CH2:15]([O:17][C:18]([C:20]#[C:21][C:22](OCC)=[O:23])=[O:19])[CH3:16]>C(O)C>[CH2:15]([O:17][C:18]([C:20]1[N:6]2[C:5]([C:7]3[CH:12]=[CH:11][C:10]([CH2:13][CH3:14])=[CH:9][CH:8]=3)=[CH:4][S:3][C:2]2=[N:1][C:22](=[O:23])[CH:21]=1)=[O:19])[CH3:16]Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
10 g of 2-amino-4-(4'-ethylphenyl)-thiazole are dissolved in 50 ml of ethanol and 8.4 g of acetylene dicarboxylic acid diethyl ester are added to the resulting solution. After standing overnight, the mixture is concentrated by evaporation in vacuo to dryness at a bath temperature of 40° to 50° C. 50 ml of chlorobenzene are added to the residue, followed by heating unter reflux for 1 hour. After concentration by evaporation in vacuo, the residue is dissolved in ether, treated with carbon, filtered and petroleum ether subsequently added. The product precipitating is washed with a little ether and dried. 3-(4'-ethylphenyl)-7H-thiazolo-[3,2-a]-pyrimidin-7-one-5-carboxylic acid ethyl ester melting at 142°-144° C. is thus obtained.