Hydroxyamine hydrochloride → 1,1,1-trifluoro-3-(1-(4-fluorophenyl)-1H-indazol-5-yloxy)-3-phenylpropan-2-one oxime

HRID 13184Notes

Reaction equation

[F:1][C:2]([F:31])([F:30])[C:3](O)(O)[CH:4]([O:11][C:12]1[CH:13]=[C:14]2[C:18](=[CH:19][CH:20]=1)[N:17]([C:21]1[CH:26]=[CH:25][C:24]([F:27])=[CH:23][CH:22]=1)[N:16]=[CH:15]2)[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1.Cl.[NH2:33][OH:34]>N1C=CC=CC=1>[F:1][C:2]([F:31])([F:30])[C:3](=[N:33][OH:34])[CH:4]([O:11][C:12]1[CH:13]=[C:14]2[C:18](=[CH:19][CH:20]=1)[N:17]([C:21]1[CH:26]=[CH:25][C:24]([F:27])=[CH:23][CH:22]=1)[N:16]=[CH:15]2)[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1

Participants

Conditions

Temperature: 115 °C

Procedure

1,1,1-trifluoro-3-(1-(4-fluorophenyl)-1H-indazol-5-yloxy)-3-phenylpropane-2,2-diol (147c) 1.22 g, 2.8 mmol) and hydroxylamine hydrochloride (3.32 g, 48 mmol) was mixed in pyridine (85 mL, dried over 4 Å MS). The mixture was stirred at 115° C. for 30 min, after which time HPLC analysis showed complete reaction. Solvent was evaporated and the residue partitioned between ethyl acetate and water. The phases were separated and the organic phase washed twice with water, followed by brine and then evaporated. The residue was subjected to chromatography (SiO2, gradient of 10-60% Ethyl acetate in Heptane) to afford somewhat impure 1,1,1-trifluoro-3-(1-(4-fluorophenyl)-1H-indazol-5-yloxy)-3-phenylpropan-2-one oxime as a 3:7 mixture of diastereomers (0.99 g, 82%).

Workup

customreaction
customSolvent was evaporated
customthe residue partitioned between ethyl acetate and water
customThe phases were separated
washthe organic phase washed twice with water
customevaporated

Sources & evidence

ORD record: ord-b60ba1a4e1934d05b72c250bd520f8a9
Source dataset: uspto-grants-2010_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07728030B2

Reaction notes

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