Hydroxyamine hydrochloride → 7-(4-chlorophenyl)-8-(4-(1-(hydroxyimino)ethyl)phenyl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

HRID 2101306Notes

Reaction equation

HRID 2101306 reaction equation
[C:1]([C:4]1[CH:9]=[CH:8][C:7]([C:10]2[C:11]3[N:12]([C:23](=[O:37])[N:24]([CH2:26][C:27]4[CH:28]=[N:29][C:30]([C:33]([F:36])([F:35])[F:34])=[CH:31][CH:32]=4)[N:25]=3)[CH:13]=[CH:14][C:15]=2[C:16]2[CH:21]=[CH:20][C:19]([Cl:22])=[CH:18][CH:17]=2)=[CH:6][CH:5]=1)(=O)[CH3:2].Cl.[NH2:39][OH:40]>C1COCC1.O>[Cl:22][C:19]1[CH:18]=[CH:17][C:16]([C:15]2[CH:14]=[CH:13][N:12]3[C:23](=[O:37])[N:24]([CH2:26][C:27]4[CH:28]=[N:29][C:30]([C:33]([F:35])([F:34])[F:36])=[CH:31][CH:32]=4)[N:25]=[C:11]3[C:10]=2[C:7]2[CH:8]=[CH:9][C:4]([C:1](=[N:39][OH:40])[CH3:2])=[CH:5][CH:6]=2)=[CH:21][CH:20]=1

Participants

5

Reactant 2

HCID 443297Hydroxyamine hydrochlorideHCID 160051638-(4-acetylphenyl)-7-(4-chlorophenyl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Product 1

HCID 732186687-(4-chlorophenyl)-8-(4-(1-(hydroxyimino)ethyl)phenyl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 8-(4-acetylphenyl)-7-(4-chlorophenyl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (43.3 mg, 0.083 mmol) in THF (2 mL) and water (2 mL) at room temperature was added hydroxylamine hydrochloride (11.5 mg, 0.17 mmol). After 108 h, the reaction mixture was diluted with water and extracted twice with EtOAc. The organic extracts are combined, dried (MgSO4), filtered and evaporated. Purification by preparative reverse phase HPLC (methanol-water-trifluoroacetic acid), pooling the fractions, evaporating, redissolving the residuum in dichloromethane, washing with saturated aq. NaHCO3 solution, drying (MgSO4), filtering and evaporating provided the title compound as a yellow solid, 38 mg, 85%. HPLC/MS: retention time=3.38 min, [M+H]+=538. 1H NMR (CDCl3): δ 8.79 (d, J=1.8 Hz, 1H), 8.62 (br s, 1H), 7.92 (dd, J=1.8, 8.0 Hz, 1H), 7.84 (d, J=7.0 Hz, 2H), 7.66 (d, J=7.9 Hz, 1H), 7.57 (dd, J=2.2, 6.6 Hz, 2H), 7.23 (m, 5H), 7.06 (d, J=6.6 Hz, 2H), 6.65 (d, J=7.1 Hz, 1H), 5.27 (s, 2H), 2.25 (s, 3H).

Workup

  1. extractionextracted twice with EtOAc
  2. dry with materialdried (MgSO4)
  3. filtrationfiltered
  4. customevaporated
  5. customPurification by preparative reverse phase HPLC (methanol-water-trifluoroacetic acid)
  6. customevaporating
  7. dissolutionredissolving the residuum in dichloromethane
  8. washwashing with saturated aq. NaHCO3 solution
  9. dry with materialdrying (MgSO4)
  10. filtrationfiltering
  11. customevaporating

Sources & evidence

ORD record
ord-30280affddbc4ba8a2aafbacf7f5686f
Source dataset
uspto-grants-2009_08
Patent number
US07572808B2

Reaction notes

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