Ethanol → 5-Fluoro-4-methoxy-1H-indazol-3-amine

HRID 1808587Notes

Reaction equation

HRID 1808587 reaction equation
[F:1][C:2]1[C:3](OC)=[C:4]([C:7](F)=[CH:8][CH:9]=1)[C:5]#[N:6].[OH2:13].[NH2:14][NH2:15].[CH2:16](O)C>>[F:1][C:2]1[C:3]([O:13][CH3:16])=[C:4]2[C:7](=[CH:8][CH:9]=1)[NH:15][N:14]=[C:5]2[NH2:6]

Participants

4

Reactant 3

HCID 702EthanolHCID 24654Hydrazine hydrate (1:1)HCID 457907333,6-Difluoro-2-methoxybenzonitrile

Product 1

HCID 580545685-Fluoro-4-methoxy-1H-indazol-3-amineYield 25%

Procedure

A mixture of 3,6-difluoro-2-methyloxybenzonitrile (for a preparation see Intermediate 55) (30 g, 184 mmol) in ethanol (300 mL) was reacted with Hydrazine Monohydrate (Alfa, 89 mL, 1.84 mol, 10 equiv.). The resulting mixture was heated at reflux overnight then allowed to cool to room temperature. Silica was added to the mixture which was then evaporated to dryness. The pre-absorbed crude reaction mixture was then purified by chromatography eluting with petrol up to EtOAc (10% steps, 500 mL per step) to give the title compound (8.4 g, 25%) as a yellow solid.

Workup

  1. temperatureThe resulting mixture was heated
  2. temperatureat reflux overnight
  3. additionSilica was added to the mixture which
  4. customwas then evaporated to dryness
  5. customThe pre-absorbed crude
  6. customreaction mixture
  7. customwas then purified by chromatography
  8. washeluting with petrol up to EtOAc (10% steps, 500 mL per step)

Sources & evidence

ORD record
ord-31d612ec58a04a4480e9fde4d4fd9ef6
Source dataset
uspto-grants-2013_01
Patent number
US08357716B2

Reaction notes

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