Hydrochloric Acid → N-[3-[5-(4-Chlorophenyl)-1-(4-methoxyphenyl)-3-pyrazolyl]-propyl]hydroxyl-amine

HRID 1761572Notes

Reaction equation

HRID 1761572 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[N:12]([C:13]3[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=3)[N:11]=[C:10]([CH2:21][CH2:22][CH:23]=[N:24][OH:25])[CH:9]=2)=[CH:4][CH:3]=1.CN(C1C=CC(N=NC2C=CC(S(O)(=O)=O)=CC=2)=CC=1)C.[BH3-]C#N.[Na+].Cl>CO>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[N:12]([C:13]3[CH:18]=[CH:17][C:16]([O:19][CH3:20])=[CH:15][CH:14]=3)[N:11]=[C:10]([CH2:21][CH2:22][CH2:23][NH:24][OH:25])[CH:9]=2)=[CH:6][CH:7]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 11037Benzenesulfonic acid, 4-(2-(4-(dimethylamino)phenyl)diazenyl)-HCID 5003444Sodium cyanoborohydrideHCID 54403492HCID 54403492, compound

Product 1

HCID 14497546N-[3-[5-(4-Chlorophenyl)-1-(4-methoxyphenyl)-3-pyrazolyl]-propyl]hydroxyl-amine

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent2×

Procedure

To a solution of the oxime 26 (2.70 g, 7.59 mM) in MeOH (50 ml), containing methyl orange (2 mg) as as indicator, was added a solution of NaBH3CN (0.52 g, 8.4 mM) in MeOH (20 ml), and a solution of 2N HCl, simultaneously, at such a rate to maintain a pH of 3 to 4. The reaction was stirred for 3 hours at room temperature, acidified to pH 1 and concentrated in vacuo. The residue was diluted with H2O (100 ml), adjusted to pH 8.5 with 5N NaOH, and extracted with EtOAc. The extracts were combined, dried (Na2SO4), filtered and concentrated in vacuo. The residue was chromatographed on Merck Silica Gel 60 (90 g, 230-400 mesh) with EtOAc:MeOH (9:1) as eluent. Crystallization from Et2O afforded pure 38 (1.64 g, 60%) as a white solid, mp=91°-93°. MS, m/e 357(M+).

Workup

  1. concentrationconcentrated in vacuo
  2. additionThe residue was diluted with H2O (100 ml)
  3. extractionextracted with EtOAc
  4. dry with materialdried (Na2SO4)
  5. filtrationfiltered
  6. concentrationconcentrated in vacuo
  7. customThe residue was chromatographed on Merck Silica Gel 60 (90 g, 230-400 mesh) with EtOAc:MeOH (9:1) as eluent
  8. customCrystallization from Et2O afforded pure 38 (1.64 g, 60%) as a white solid, mp=91°-93°

Sources & evidence

ORD record
ord-f724477a705d4aa7a36fab78976fd40d
Source dataset
uspto-grants-1989_05
Patent number
US04826868

Reaction notes

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