Formaldehyde → 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl) benzoic acid amide

HRID 910378Notes

Reaction equation

HRID 910378 reaction equation
[NH2:1][C:2]1[CH:15]=[C:14]([C:16]2[CH2:20][C:19]([C:25]3[CH:30]=[C:29]([Cl:31])[CH:28]=[C:27]([Cl:32])[CH:26]=3)([C:21]([F:24])([F:23])[F:22])[O:18][N:17]=2)[CH:13]=[CH:12][C:3]=1[C:4]([NH:6][CH2:7][C:8]([F:11])([F:10])[F:9])=[O:5].C=O.[C:35](O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>ClCCCl>[Cl:32][C:27]1[CH:26]=[C:25]([C:19]2([C:21]([F:24])([F:23])[F:22])[O:18][N:17]=[C:16]([C:14]3[CH:13]=[CH:12][C:3]([C:4]([NH:6][CH2:7][C:8]([F:10])([F:9])[F:11])=[O:5])=[C:2]([NH:1][CH3:35])[CH:15]=3)[CH2:20]2)[CH:30]=[C:29]([Cl:31])[CH:28]=1

Participants

5

Reactant 3

HCID 712FormaldehydeHCID 5049666Sodium triacetoxyborohydrideHCID 866114682-amino-4-[5-(3,5-dichlorophenyl)-5-trifiuoromethyl-4,5-dihydroisoxazol-3-yl]-N-(2,2,2-trifiuoroethyl) benzoic acid amide

Product 1

HCID 866114744-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl) benzoic acid amideYield 50.6%

Reagents, catalysts & solvents 1

HCID 111,2-DichloroethaneSolvent

Procedure

In a solution of 0.25 g of 2-amino-4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-N-(2,2,2-trifluoroethyl)benzoic acid amide (Compound of the present invention No. 5-329) synthesized in Synthetic Example 12 and 0.06 g of 36% formaldehyde aqueous solution in 7 ml of 1,2-dichloroethane, 1.00 g of sodium triacetoxy borohydride was added with stirring at room temperature in three portions at 1 hour-interval, and continued to stir at the same temperature for further 2 hours. After the completion of the reaction, the reaction mixture was poured to 5 ml of ice water, the organic phase was collected, and the solvent was distilled under reduced pressure. The residue was subjected to purification with medium-pressure preparative liquid chromatography (Yamazen Corporation, medium pressure preparative system; YFLC-Wprep) that was eluted with ethyl acetate-hexane (0:1 to 1:3 gradient), and 0.13 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide was obtained as pale yellow crystal, and 0.13 g of 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-dimethylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide was obtained as pale yellow resinous substance. 4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazole-3-yl]-2-methylamino-N-(2,2,2-trifluoroethyl)benzoic acid amide;

Workup

  1. additionwas added
  2. stirringto stir at the same temperature for further 2 hours
  3. customAfter the completion of the reaction
  4. customthe organic phase was collected
  5. distillationthe solvent was distilled under reduced pressure
  6. customThe residue was subjected to purification with medium-pressure preparative liquid chromatography (Yamazen Corporation, medium pressure preparative system; YFLC-Wprep) that
  7. washwas eluted with ethyl acetate-hexane (0:1 to 1:3 gradient)

Sources & evidence

ORD record
ord-77270ab4eaea4d438ec348ebedde6ab0
Source dataset
uspto-grants-2011_09
Patent number
US08022089B2

Reaction notes

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