Imidazole → 5-tert-Butyl-2-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2H-pyrazol-3-ylamine

HRID 75582Notes

Reaction equation

HRID 75582 reaction equation
[NH2:1][C:2]1[N:6]([CH2:7][CH2:8][OH:9])[N:5]=[C:4]([C:10]([CH3:13])([CH3:12])[CH3:11])[CH:3]=1.[C:14]([Si:18]([CH3:21])([CH3:20])Cl)([CH3:17])([CH3:16])[CH3:15].N1C=CN=C1>CN(C=O)C.[NH4+].[Cl-].C(Cl)Cl>[C:10]([C:4]1[CH:3]=[C:2]([NH2:1])[N:6]([CH2:7][CH2:8][O:9][Si:18]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:21])[CH3:20])[N:5]=1)([CH3:13])([CH3:12])[CH3:11]

Participants

7

Reactant 3

HCID 795Imidazole2×HCID 28928tert-Butyldimethylsilyl chloride2×HCID 162278772-(5-amino-3-tert-butyl-1H-pyrazol-1-yl)ethan-1-ol

Product 1

HCID 685465445-tert-Butyl-2-[2-(tert-butyl-dimethyl-silanyloxy)-ethyl]-2H-pyrazol-3-ylamineYield 70.8%

Reagents, catalysts & solvents 3

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolventHCID 25517Ammonium ChlorideSolvent

Procedure

A solution of Intermediate 10a (1.00 g, 5.46 mmol), tert-butyl-dimethyl-chlorosilane (823 mg. 5.46 mmol), and imidazole (774 mg, 11.38 mmol) in DMF (9 mL) was stirred at RT under a nitrogen atmosphere for 18 h. Additional tert-butyl-dimethyl-chlorosilane (823 mg. 5.46 mmol) and imidazole (774 mg, 11.38 mmol) were added to the reaction mixture and stirred for 6 h. The reaction mixture was diluted with NH4Cl saturated aqueous solution (10 mL) and DCM (10 mL). The layers were separated and aqueous layer was extracted with DCM (3×10 mL). The combined organic layers were dried (MgSO4), filtered, concentrated in vacuo and purified by FCC, using 0-50% EtOAc in cyclohexane, to give the title compound (1.15 g, 70%). LCMS (Method 3): Rt 3.06, 3.23 min, m/z 298 [MH+].

Workup

  1. customThe layers were separated
  2. extractionaqueous layer was extracted with DCM (3×10 mL)
  3. dry with materialThe combined organic layers were dried (MgSO4)
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. custompurified by FCC

Sources & evidence

ORD record
ord-c6fa2d76bd83443c9d960107ef431270
Source dataset
uspto-grants-2014_09
Patent number
US08835431B2

Reaction notes

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