Diethyl (ethoxymethylene)malonate → HCID 178469756, Verbindung
Reaktionsgleichung
C(O[CH:4]=[C:5]([C:11]([O:13]CC)=O)[C:6]([O:8][CH2:9][CH3:10])=[O:7])C.[CH:16]1[C:21]([CH2:22][C:23]([NH2:25])=[NH:24])=[CH:20][C:19]([Cl:26])=[C:18]([Cl:27])[CH:17]=1>>[OH:13][C:11]1[C:5]([C:6]([O:8][CH2:9][CH3:10])=[O:7])=[CH:4][N:24]=[C:23]([CH2:22][C:21]2[CH:16]=[CH:17][C:18]([Cl:27])=[C:19]([Cl:26])[CH:20]=2)[N:25]=1Komponenten
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.