Acetic Acid → N-benzyl-N-nitroso-2-[2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-2-cyclopentyl-acetamide

HRID 417153Notes

Reaction equation

HRID 417153 reaction equation
[CH2:1]([NH:8][C:9](=[O:34])[CH:10]([N:16]1[C:20]2[CH:21]=[C:22]([F:26])[C:23]([F:25])=[CH:24][C:19]=2[N:18]=[C:17]1[C:27]1[CH:32]=[CH:31][C:30]([Cl:33])=[CH:29][CH:28]=1)[CH:11]1[CH2:15][CH2:14][CH2:13][CH2:12]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(O)(=O)C.C(OC(=O)C)(=O)C.[N:46]([O-])=[O:47].[Na+]>>[CH2:1]([N:8]([N:46]=[O:47])[C:9](=[O:34])[CH:10]([N:16]1[C:20]2[CH:21]=[C:22]([F:26])[C:23]([F:25])=[CH:24][C:19]=2[N:18]=[C:17]1[C:27]1[CH:28]=[CH:29][C:30]([Cl:33])=[CH:31][CH:32]=1)[CH:11]1[CH2:12][CH2:13][CH2:14][CH2:15]1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

5

Reactant 4

HCID 176Acetic AcidHCID 7918Acetic AnhydrideHCID 23668193Sodium NitriteHCID 66619313N-benzyl-2-[2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-2-cyclopentyl-acetamide

Product 1

HCID 86639902N-benzyl-N-nitroso-2-[2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-2-cyclopentyl-acetamide

Procedure

To a ice-cold solution of 9.50 g (19.79 mmol) N-benzyl-2-[2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-2-cyclopentyl-acetamide in 64.53 ml (1128 mmol) acetic acid and 135.84 ml (2395 mmol) acetic anhydride were added in portions over 60 min. 6.83 g (99 mmol) sodium nitrite. The reaction mixture was stirred for 1 h in an ice-bath, then at room temperature overnight. The mixture was evaporated and the residue was taken up in saturated aqueous sodium bicarbonate solution and ethyl acetate and solid sodium bicarbonate was added to adjust the pH to 7. The aqueous layer was extracted twice with ethyl acetate and the combined organic layers were washed with brine, dried over magnesium sulfate, filtered and evaporated. The remaining brown foam was purified by silica gel chromatography using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of heptane and ethyl acetate (100:0 to 50:50). Yellow solid (72%). MS (Turbo Spray): m/z=509.2 [M+H].

Workup

  1. customat room temperature
  2. customovernight
  3. customThe mixture was evaporated
  4. additionethyl acetate and solid sodium bicarbonate was added
  5. extractionThe aqueous layer was extracted twice with ethyl acetate
  6. washthe combined organic layers were washed with brine
  7. dry with materialdried over magnesium sulfate
  8. filtrationfiltered
  9. customevaporated
  10. customThe remaining brown foam was purified by silica gel chromatography
  11. washeluting with a gradient of heptane and ethyl acetate (100:0 to 50:50)

Sources & evidence

ORD record
ord-51a8cb38c8b445c7b75cfd60e4495b45
Source dataset
uspto-grants-2012_01
Patent number
US08088930B2

Reaction notes

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