5-chloro-4-nitro-1H-indazole → 5-Chloro-1H-indazol-4-amine

HRID 1444487Notes

Reaction equation

HRID 1444487 reaction equation
[Cl:1][C:2]1[C:3]([N+:11]([O-])=O)=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][N:6]=[CH:5]2>[Pd]>[Cl:1][C:2]1[C:3]([NH2:11])=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][N:6]=[CH:5]2

Participants

3

Reactant 1

HCID 179892685-chloro-4-nitro-1H-indazole

Product 1

HCID 179892615-Chloro-1H-indazol-4-amine

Reagents, catalysts & solvents 1

HCID 23938PalladiumCatalyst

Procedure

A solution that consists of 5-chloro-4-nitro-1H-indazole (872 mg, 4.41 mmol) is mixed with 150 mg of palladium on carbon (10%) and stirred under hydrogen atmosphere at room temperature. After 45 minutes, the catalyst is suctioned off on one frit and washed with methanol. The filtrate is concentrated by evaporation, and the residue is taken up in 200 ml of ethyl acetate and heated. After renewed suctioning-off and concentration by evaporation of the filtrate, the purification on silica gel is carried out with hexane/ethyl acetate (100-33% hexane). 296 mg (40% of theory) of the product is obtained.

Workup

  1. washwashed with methanol
  2. concentrationThe filtrate is concentrated by evaporation
  3. temperatureheated
  4. concentrationconcentration
  5. customby evaporation of the filtrate
  6. customthe purification on silica gel
  7. custom296 mg (40% of theory) of the product is obtained

Sources & evidence

ORD record
ord-4c2200109c0749ffab074f3e8178619f
Source dataset
uspto-grants-2010_02
Patent number
US07662821B2

Reaction notes

Loading…