Hydroxylamine → HCID 178513254, compound

HRID 841549Notes

Reaction equation

HRID 841549 reaction equation
[F:1][C:2]1[CH:27]=[CH:26][CH:25]=[C:24]([F:28])[C:3]=1[CH2:4][N:5]1[C:9]2[CH:10]=[CH:11][CH:12]=[C:13]([C:14]#[N:15])[C:8]=2[N:7]=[C:6]1[C:16]1[C:21]([F:22])=[CH:20][CH:19]=[CH:18][C:17]=1[F:23].C(N(CC)CC)C.[NH2:36][OH:37]>C(O)C>[OH:37][NH:36][C:14]([C:13]1[C:8]2[N:7]=[C:6]([C:16]3[C:17]([F:23])=[CH:18][CH:19]=[CH:20][C:21]=3[F:22])[N:5]([CH2:4][C:3]3[C:24]([F:28])=[CH:25][CH:26]=[CH:27][C:2]=3[F:1])[C:9]=2[CH:10]=[CH:11][CH:12]=1)=[NH:15]

Participants

5

Reactant 3

HCID 787HydroxylamineHCID 8471TriethylamineHCID 98647011-(2,6-Difluorobenzyl)-2-(2,6-difluorophenyl)benzimidazole-4-carbonitrile

Product 1

HCID 178513254HCID 178513254, compoundYield 87.3%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To 1-(2,6-Difluorobenzyl)-2-(2,6-difluorophenyl)benzimidazole-4-carbonitrile (Example 105) (0.60 g, 1.57 mmol) dissolved in ethanol (15 mL) and triethylamine (0.5 mL) was added hydroxylamine (0.14 g, 130 M%). After 24 h at reflux, the reaction was concentrated. The residue was redissolved in CH2Cl2 and washed with NaHSO4(10% soln), NaHCO3 (sat. aq) and NaCl (sat. aq). The combined washings were dried (Na2SO4), filtered and concentrated. The crude product was purified by flash chromatography eluting with 4% methanol/CH2Cl2 and recrystallization from methanol, yielding white crystals of N-hydroxy 1-(2,6-difluorobenzyl)-2-(2,6-difluorophenyl)benzimidazole-4-carboxamidine (0.57 g, 1.37 mmol, 87% yield). M.p. 214-216° C. 1H NMR (200 MHz, CD2Cl2): δ7.84 (dd, J=1.1, 7.7 Hz, 1H, H5), 7.57 (m, 1H, H4′), 7.54 (dd, J=1.1, 8.2 Hz, 11H, H7), 7.30 (dd, J=7.7, 8.2 Hz, 1H, H6), 7.28 (m, 1H, H4″), 7.11 (m, 2H, H3′,5′), 6.83 (m, 2H, H3″,5″), 6.61 (br, 2H, NH2), 5.39 (s, 2H, CH2PhF2).

Workup

  1. temperatureAfter 24 h at reflux
  2. concentrationthe reaction was concentrated
  3. dissolutionThe residue was redissolved in CH2Cl2
  4. washwashed with NaHSO4(10% soln), NaHCO3 (sat. aq) and NaCl (sat. aq)
  5. dry with materialThe combined washings were dried (Na2SO4)
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe crude product was purified by flash chromatography
  9. washeluting with 4% methanol/CH2Cl2 and recrystallization from methanol

Sources & evidence

ORD record
ord-c695c4d6d2f44380811948dd466e9f78
Source dataset
uspto-grants-2002_04
Patent number
US06369235B1

Reaction notes

Loading…