Sodium Hydroxide → 5-Hydroxy-3-phenyl-5-(trifluoromethyl)-4,5-dihydroisoxazole

HRID 1897147

Reaction equation

HRID 1897147 reaction equation
[C:1]([CH2:9][C:10]([C:12]([F:15])([F:14])[F:13])=O)(=O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.Cl.[NH2:17][OH:18].[OH-:19].[Na+]>>[C:2]1([C:1]2[CH2:9][C:10]([OH:19])([C:12]([F:13])([F:14])[F:15])[O:18][N:17]=2)[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

4

Reactant 3

HCID 14798Sodium HydroxideHCID 675894,4,4-Trifluoro-1-phenyl-1,3-butanedioneHCID 443297Hydroxyamine hydrochloride

Product 1

HCID 28809765-Hydroxy-3-phenyl-5-(trifluoromethyl)-4,5-dihydroisoxazoleYield 91.5%

Procedure

Prepared according to J. Org. Chem., 1995, 60, 3907. A solution of benzoyltrifluoroacetone (21 g, 97 mmol) was added dropwise over 1 h, at 20-30° C., to a solution of hydroxylamine HCl (6.82 g, 98 mmol) containing sodium hydroxide (2 N, 51 mL, 102 mmol) and the resulting mixture heated under reflux for 45 min. After cooling to room temperature, the mixture was poured into ice-water (500 mL), the precipitate was filtered off, washed with water and dried under vacuum to afford the title compound (20.51 g, 91%) which was obtained as a white solid. MS: m/e=230.2 [M−H]−.

Workup

  1. customPrepared
  2. temperaturethe resulting mixture heated
  3. temperatureunder reflux for 45 min
  4. filtrationthe precipitate was filtered off
  5. washwashed with water
  6. customdried under vacuum

Sources & evidence

ORD record
ord-eb36ff2a3e604164945d9b28e61d89bd
Source dataset
uspto-grants-2013_08
Patent number
US08518974B2

Linked notes

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