Hydrazine → HCID 21220612, Verbindung
Reaktionsgleichung
Cl[C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[CH:6][N:5]=[C:4]([CH2:13][C:14]2C=[CH:18][C:17]([Cl:20])=[C:16]([Cl:21])[CH:15]=2)[N:3]=1.[NH2:22][NH2:23]>>[NH:22]([C:2]1[C:7]([C:8]([O:10][CH2:11][CH3:12])=[O:9])=[CH:6][N:5]=[C:4]([C:13]2[CH:14]=[CH:15][C:16]([Cl:21])=[C:17]([Cl:20])[CH:18]=2)[N:3]=1)[NH2:23]Komponenten
3
Versuchsvorschrift
The title compound was prepared by (a) of diethyl ethoxymethylenemalonate (6 g, 27 mmol) with 3',4'-dichlorophenylacetamidine (5.5 g, 27 mmol) to afford 37% of ethyl 4-hydroxy-2-(3',4'-dichlorobenzyl)pyrimidine-5-carboxylate in analogy to Example 15, (b) reaction of ethyl 4-hydroxy-2-(3',4'-dichlorobenzyl)pyrimidine-5-carboxylate (2 g, 6 mmol) with POCl3 (14 g, 92 mmol) to afford 62% of ethyl 4-chloro-2-(3',4'-dichlorobenzyl)pyrimidine-5-carboxylate in analogy to Example 7, (c) reaction of ethyl 4-chloro-2-(3',4'-dichlorobenzyl)pyrimidine-5-carboxylate (1 g, 2.8 mmol) with hydrazine (0.27 g, 8.3 mmol) to afford 99% of ethyl 4-hydrazino-2-(3',4'-dichlorophenyl)pyrimidine-5-carboxylate in analogy to Example 18, (d) reaction of ethyl 4-hydrazino-2-(3',4'-dichlorobenzyl)pyrimidine-5-carboxylate (0.9 g, 2.7 mmol) with citraconic anhydride (0.49 g, 4.4 mmol) in analogy to Example 21 to afford 47% (0.3 g) of the title compound; m.p. 119-121° C.