Methanol → 1-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-1h-pyrazole-4-carboxylic acid

HRID 1505287Notes

Reaction equation

HRID 1505287 reaction equation
C[O:2][C:3]([C:5]1[CH:6]=[N:7][N:8]([C:10]2[CH2:14][C:13]([C:19]3[CH:24]=[C:23]([Cl:25])[CH:22]=[C:21]([Cl:26])[CH:20]=3)([C:15]([F:18])([F:17])[F:16])[O:12][N:11]=2)[CH:9]=1)=[O:4].[OH-].[Na+].CO>C1COCC1.O>[Cl:25][C:23]1[CH:24]=[C:19]([C:13]2([C:15]([F:18])([F:16])[F:17])[O:12][N:11]=[C:10]([N:8]3[CH:9]=[C:5]([C:3]([OH:4])=[O:2])[CH:6]=[N:7]3)[CH2:14]2)[CH:20]=[C:21]([Cl:26])[CH:22]=1

Participants

5

Reactant 3

HCID 887MethanolHCID 14798Sodium HydroxideHCID 584979541-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-1H-pyrazole-4-carboxylic acid methyl ester

Product 1

HCID 584979271-[5-(3,5-Dichloro-phenyl)-5-trifluoromethyl-4,5-dihydro-isoxazol-3-yl]-1h-pyrazole-4-carboxylic acidYield 91.2%

Reagents, catalysts & solvents 1

HCID 21881883Oxolane--water (1/1)Solvent

Procedure

To a solution of methyl ester of example 19.1 (513 mg) in 12.5 ml THF:water (4:1) was added sodium hydroxide (75 mg). The reaction mixture was stirred at room temperature for 3 hours before adding 2 ml of methanol. The reaction was stirred overnight before evaporation of the solvent in vacuo. The aqueous layer was extracted with ethyl acetate before being acidified. It was then extracted several times with ethyl acetate. The combined organic layers were dried over sodium sulfate and concentrated to afford the title acid (452 mg) as a yellow solid. 1H-NMR (CDCl3, 400 MHz): 8.55 (s, 1H), 8.05 (s, 1H), 7.50 (m, 2H), 7.45 (m, 1H), 4.35 (d, 1H), 4.00 (d, 1H).

Workup

  1. stirringThe reaction was stirred overnight before evaporation of the solvent in vacuo
  2. extractionThe aqueous layer was extracted with ethyl acetate
  3. extractionIt was then extracted several times with ethyl acetate
  4. dry with materialThe combined organic layers were dried over sodium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-67a4a8d983254ad081fcbd0c746e136c
Source dataset
uspto-grants-2015_12
Patent number
US09216973B2

Reaction notes

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