Pentanenitrile, 4,4-dimethyl-3-oxo- → 3-tert-butyl-1-pyridin-4-yl-1H-pyrazol-5-amine

HRID 1864658Notes

Reaction equation

HRID 1864658 reaction equation
[NH:1]([C:3]1[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=1)[NH2:2].[CH3:9][C:10]([CH3:17])([CH3:16])[C:11](=O)[CH2:12][C:13]#[N:14]>C1(C)C=CC=CC=1>[C:10]([C:11]1[CH:12]=[C:13]([NH2:14])[N:1]([C:3]2[CH:8]=[CH:7][N:6]=[CH:5][CH:4]=2)[N:2]=1)([CH3:17])([CH3:16])[CH3:9]

Participants

4

Reactant 2

HCID 108871Pentanenitrile, 4,4-dimethyl-3-oxo-HCID 4166314-Hydrazinopyridine

Product 1

HCID 109000523-tert-butyl-1-pyridin-4-yl-1H-pyrazol-5-amineYield 51.6%

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Procedure

4-hydrazinopyridine hydrochloride (400 mg, 2.74 mmol) was dissolved in MeOH and passed through a column filled with the ion-exchange resin Ambersep 900-OH (Fluka). MeOH was eluted until no product remains in the column (checked by TLC). Concentration of the resulting methanolic solution afforded 4-hydrazinopyridine (285 mg, 95%) as a red oil. 1H-NMR (δ, ppm, DMSO-d6): 4.14 (s, 2H, NH2), 6.62 (d, 2H, Harom,Py, J=6.2 Hz), 7.51 (s, 1H, NH), 8.00 (d, 2H, Harom,Py, J=6.2 Hz). A mixture of 4-hydrazinopyridine (285 mg, 2.61 mmol) and 4,4-dimethyl-3-oxopentanenitrile (327 mg, 2.61 mmol) in toluene (1 mL) was heated under reflux during 16 h. After cooling to room temperature, evaporation of the solvent in vacuo afforded a brown residue which was purified by chromatography on silica gel (cyclohexane-EtOAc, 6:4 until 3:7). The title compound (291 mg, 51%) was obtained as a pale yellow solid (Rf 0.27, cyclohexane-EtOAc, 3:7). 1H-NMR (δ, ppm, DMSO-d6): 1.22 (s, 9H, t-Bu), 5.46 (s, 1H, HPyz,4), 5.56 (s, 2H, NH2), 7.70 (s, 2H, Harom,Py), 8.56 (s, 2H, Harom,Py). 13C-NMR (δ, ppm, DMSO-d6): 29.8 ((CH3)3), 31.9 (C(CH3)3), 88.7 (CPyz,4), 114.6 (CPy,3+5), 146.0 and 148.5 (CPyz,5 and CPyz,3), 150.4 (CPy,2+6), 162.5 (CPyz,4). LC-MS (m/z): 217 (M+H, 100).

Workup

  1. temperaturewas heated
  2. temperatureunder reflux during 16 h
  3. customevaporation of the solvent in vacuo
  4. customafforded a brown residue which
  5. customwas purified by chromatography on silica gel (cyclohexane-EtOAc, 6:4 until 3:7)

Sources & evidence

ORD record
ord-249830808b3c4453a084b8633505e820
Source dataset
uspto-grants-2009_12
Patent number
US07625922B2

Reaction notes

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