Hydrazine → HCID 21220620, compound
Reaction equation
Cl[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:18]=[CH:17][C:16]([C:19]([F:22])([F:21])[F:20])=[CH:15][CH:14]=2)[N:3]=1.[NH2:23][NH2:24]>>[NH:23]([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:18]=[CH:17][C:16]([C:19]([F:22])([F:21])[F:20])=[CH:15][CH:14]=2)[N:3]=1)[NH2:24]Participants
Procedure
The title compound was prepared by (a) of diethyl ethoxymethylenemalonate (6.3 g, 29 mmol) with 4-trifluoromethylphenylbenzamidine (5.5 g, 29 mmol) to afford 50% of ethyl 4-hydroxy-2-(4'-trifluoromethylphenyl)pyrimidine-5-carboxylate in analogy to Example 15, (b) reaction of ethyl 4-hydroxy-2-(4'-trifluoromethylphenyl)pyrimidine-5-carboxylate (3 g, 9.6 mmol) with POCl3 (49 g, 322 mmol) to afford 97% of ethyl 4-chloro-2-(4'-trifluoromethylphenyl)pyrimidine-5-carboxylate in analogy to Example 7, (c) reaction of ethyl 4-chloro-2-(4'-trifluoromethylphenyl)pyrimidine-5-carboxylate (2 g, 6 mmol) with hydrazine (0.6 g, 18 mmol) to afford 60% of ethyl 4-hydrazino-2-(4'trifluoromethylphenyl)pyrimidine-5-carboxylate in analogy to Example 18, (d) reaction of ethyl 4-hydrazino-2-(4'-trifluoromethylphenyl)pyrimidine-5-carboxylate (1 g, 3 mmol) with citraconic anhydride (1 g, 9 mmol) to afford 40% (0.5 g) of the title compound (m.p. 148-150° C.) in analogy to Example 21.
Sources & evidence
- ORD record
- ord-97baa7dec7c042cdb8b1c6649fe0e973
- Source dataset
- uspto-grants-1999_08
- Patent number
- US05935966
Reaction notes
Loading…