Hydrochloric Acid → 7-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzo[1,2,5]thiadiazole-4-carboxylic acid

HRID 536423Notes

Reaction equation

HRID 536423 reaction equation
C[O:2][C:3]([C:5]1[C:10]2=[N:11][S:12][N:13]=[C:9]2[C:8]([C:14]2[CH2:18][C:17]([C:23]3[CH:28]=[C:27]([Cl:29])[CH:26]=[C:25]([Cl:30])[CH:24]=3)([C:19]([F:22])([F:21])[F:20])[O:16][N:15]=2)=[CH:7][CH:6]=1)=[O:4].[OH-].[Na+].Cl>O1CCCC1.C(OCC)(=O)C>[Cl:29][C:27]1[CH:28]=[C:23]([C:17]2([C:19]([F:22])([F:20])[F:21])[O:16][N:15]=[C:14]([C:8]3[C:9]4[C:10](=[N:11][S:12][N:13]=4)[C:5]([C:3]([OH:4])=[O:2])=[CH:6][CH:7]=3)[CH2:18]2)[CH:24]=[C:25]([Cl:30])[CH:26]=1

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 584979897-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzo[1,2,5]thiadiazole-4-carboxylic acid methyl ester

Product 1

HCID 584979767-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzo[1,2,5]thiadiazole-4-carboxylic acidYield 33.1%

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a solution of 7-[5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro-isoxazol-3-yl]-benzo[1,2,5]thiadiazole-4-carboxylic acid methyl ester (4.01 g) (Example I7) in tetrahydrofuran (30 ml) was added aqueous sodium hydroxide (1M) (25.3 ml). The reaction mixture was stirred at ambient temperature for 1.5 hours. Aqueous hydrochloric acid (1M) (100 ml) was added and the mixture diluted with ethyl acetate (150 ml). After separation of the layers, the aqueous layer was extracted with ethyl acetate (2×75 ml). The combined organic layers were washed with water (75 ml) and brine (75 ml), dried over sodium sulfate and concentrated. The residue was purified by column chromatography (dichloromethane/methanol) to give 7-[5-(3,5-dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-benzo[1,2,5]thiadiazole-4-carboxylic acid (1.29 g) as yellow solid. 1H-NMR (DMSO-d6, 400 MHz): 13.67 (bs, 1H), 8.37-7.26 (m, 5H), 4.76 (d, 1H), 4.53 (d, 1H) ppm.

Workup

  1. customAfter separation of the layers
  2. extractionthe aqueous layer was extracted with ethyl acetate (2×75 ml)
  3. washThe combined organic layers were washed with water (75 ml) and brine (75 ml)
  4. dry with materialdried over sodium sulfate
  5. concentrationconcentrated
  6. customThe residue was purified by column chromatography (dichloromethane/methanol)

Sources & evidence

ORD record
ord-fc48ed31853c4391ad1effb3cfac59bb
Source dataset
uspto-grants-2014_10
Patent number
US08859592B2

Reaction notes

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