3-(Trifluoromethyl)benzaldehyde → 5-Amino-2-phenoxy-benzoic acid (3-trifluoromethyl-benzylidene)-hydrazide
Reaction equation
[NH2:1][C:2]1[CH:3]=[CH:4][C:5]([O:12][C:13]2[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=2)=[C:6]([CH:11]=1)[C:7]([NH:9][NH2:10])=[O:8].[F:19][C:20]([F:30])([F:29])[C:21]1[CH:22]=[C:23]([CH:26]=[CH:27][CH:28]=1)[CH:24]=O>>[F:19][C:20]([F:29])([F:30])[C:21]1[CH:22]=[C:23]([CH:26]=[CH:27][CH:28]=1)[CH:24]=[N:10][NH:9][C:7](=[O:8])[C:6]1[CH:11]=[C:2]([NH2:1])[CH:3]=[CH:4][C:5]=1[O:12][C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1Participants
Procedure
A mixture of phenol (5.64 g, 60 mmol) and potassium t-butoxide (6.74 g, 60 mmol) in 50 mL 1,4-dioxane was stirred at room temperature for 0.5 h. To the mixture was added 2-chloro-5-nitro-benzoic acid methyl ester (10.78 g, 50 mmol) and the mixture was refluxed overnight. The solvent was evaporated and the residue was purified by chromatography with EtOAc:hexanes, 1:4, as eluant, yielding (11.739 g, 86%) 5-nitro-2-phenoxy-benzoic acid methyl ester. A mixture of 5-nitro-2-phenoxy-benzoic acid methyl ester (2.0 g, 7.32 mmol) in 30 mL ethanol and Pd/C (200 mg) were hydrogenated at 40 psi overnight to yield 5-amino-2-phenoxy-benzoic acid methyl ester (1.672 g, 94%). A mixture of 5-amino-2-phenoxy-benzoic acid methyl ester (0.95 g, 3.9 mmol) and hydrazine (4 mL, 80%) was refluxed for 4 h to yield 5-amino-2-phenoxy-benzoic acid hydrazide (0.722 g, 76%). The title compound was prepared from 5-amino-2-phenoxy-benzoic acid hydrazide and 3-trifluoromethyl-benzaldehyde by a procedure similar to Example 22. 1H NMR (CDCl3): 10.81 (s, 1H), 8.15 (s, 1H), 8.0 (s, 1H), 7.98 (d, J=7.5 Hz, 1H), 7.66 (s, 1H), 7.64 (d, J=7.5 Hz, 1H), 7.53 (t, J=7.2 Hz, 1H), 7.40 (m, 2H), 7.19 (t, J=7.5 Hz, 1H), 7.07 (d, J=7.8, 2H), 6.80 (m, 2H).
Sources & evidence
- ORD record
- ord-898a7e5b7d5f4139bbe31d833358bcfb
- Source dataset
- uspto-grants-2004_04
- Patent number
- US06716859B2
Reaction notes
Loading…