Hydrochloric Acid → HCID 12862389, Verbindung
Reaktionsgleichung
[CH3:1][CH:2]([C:4]1[S:20][C:7]2[N:8]=[C:9]3[CH:16]=[CH:15][C:14]([C:17]([OH:19])=[O:18])=[CH:13][N:10]3[C:11](=[O:12])[C:6]=2[CH:5]=1)[CH3:3].Cl.[CH2:22](O)[CH3:23]>>[CH3:3][CH:2]([C:4]1[S:20][C:7]2[N:8]=[C:9]3[CH:16]=[CH:15][C:14]([C:17]([O:19][CH2:22][CH3:23])=[O:18])=[CH:13][N:10]3[C:11](=[O:12])[C:6]=2[CH:5]=1)[CH3:1]Komponenten
4
Reaktionsbedingungen
- Temperatur
- 128 °C
Versuchsvorschrift
A cooled suspension of 1.4 g (0.00486 mol) of 2-(1-methylethyl)-4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidin-7-carboxylic acid (Example 18) in 150 ml of ethanol is saturated with hydrogen chloride. The mixture is stirred and refluxed in a wax bath at 128° C. for eighteen hours under nitrogen. The ethanol is evaporated in vacuo to give 0.43 g of 2-(1-methylethyl)-4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine-7-carboxylic acid, ethyl ester; mp 122°-123° C. after recrystallization from absolute ethanol.