Methylhydrazine → 1-Methyl-3-Pyridin-2-Yl-1H-Pyrazol-5-Amine

HRID 1748789Notes

Reaction equation

HRID 1748789 reaction equation
O=[C:2]([C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][N:7]=1)[CH2:3][C:4]#[N:5].[CH3:12][NH:13][NH2:14]>C(O)C>[CH3:12][N:13]1[C:4]([NH2:5])=[CH:3][C:2]([C:6]2[CH:11]=[CH:10][CH:9]=[CH:8][N:7]=2)=[N:14]1

Participants

4

Reactant 2

HCID 6061MethylhydrazineHCID 115718233-Oxo-3-(pyridin-2-yl)propanenitrile

Product 1

HCID 133248371-Methyl-3-Pyridin-2-Yl-1H-Pyrazol-5-AmineYield 63%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

To a solution of crude 3-oxo-3-(2-pyridyl)propanenitrile (48.6 g, 331 mmol) in ethanol (500 mL) was added methyl hydrazine (25 g, 543 mmol). The resulting mixture was stirred for about 30 min at rt and then heated at about 75° C. for about 18 h. After cooling to rt the reaction mixture was concentrated in vacuo. The residue was treated with toluene (300 mL). The formed solid was collected by filtration and washed with toluene (150 mL). The solid was dried under vacuum to give 2-methyl-5-(2-pyridyl)pyrazol-3-amine (36.2 g, 208 mmol, 63%). 1H-NMR (CDCl3, Bruker 400 MHz) δ 3.62 (3H, s); 5.34 (2H, br s); 5.90 (1H, s); 7.21 (1H, m); 7.73 (1H, dt, J=10 Hz, 2 Hz); 7.83 (1H, dt, J=10 Hz, 1 Hz); 8.51 (1H, dt, J=6 Hz, 2 Hz).

Workup

  1. temperatureheated at about 75° C. for about 18 h
  2. temperatureAfter cooling to rt the reaction mixture
  3. concentrationwas concentrated in vacuo
  4. additionThe residue was treated with toluene (300 mL)
  5. filtrationThe formed solid was collected by filtration
  6. washwashed with toluene (150 mL)
  7. customThe solid was dried under vacuum

Sources & evidence

ORD record
ord-be39aef74971402aa49806a4b6356f07
Source dataset
uspto-grants-2015_10
Patent number
US09150592B2

Reaction notes

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