Phosphorus oxychloride → 4-((4-Chloropyrimidin-2-yl)amino)benzonitrile
Reaktionsgleichung
O=[C:2]1[CH:7]=[CH:6][NH:5][C:4]([NH:8][C:9]2[CH:16]=[CH:15][C:12]([C:13]#[N:14])=[CH:11][CH:10]=2)=[N:3]1.O=P(Cl)(Cl)[Cl:19]>>[Cl:19][C:2]1[CH:7]=[CH:6][N:5]=[C:4]([NH:8][C:9]2[CH:16]=[CH:15][C:12]([C:13]#[N:14])=[CH:11][CH:10]=2)[N:3]=1Komponenten
3
Versuchsvorschrift
In particular, a mixture of 4-[(1,4-dihydro-4-oxo-2-pyrimidinyl)amino]benzonitrile (0.12 mol) in POCl3 (90 ml) was stirred and refluxed under Argon for 20 minutes. The reaction mixture was slowly poured onto 750 ml ice/water, and the solid was separated by filtration. The solid was suspended in 500 ml of water, and the pH of the suspension was adjusted to neutral by adding a 20% NaOH solution. The solid was again separated by filtration, suspended in 200 ml of 2-propanone, and 1000 ml of CH2Cl2 was added. The mixture was heated until all solid had dissolved. After cooling to room temperature, the aqueous layer was separated, and the organic layer was dried. During removal of the drying agent by filtration, a white solid formed in the filtrate. Further cooling of the filtrate in the freezer, followed by filtration, yielded 21.38 g (77.2%) of [4-[(4-chloro-2-pyrimidinyl)amino]benzonitrile, i.e. the intermediate of formula (III-a).