Aminopyridazine → (1-Imidazo[1,2-b]pyridazin-2-yl-ethyl)-carbamic acid benzyl ester

HRID 2036655Notes

Reaction equation

HRID 2036655 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([NH2:7])[N:2]=1.[CH2:8]([O:15][C:16](=[O:24])[NH:17][CH:18]([CH3:23])[C:19](=O)[CH2:20]Br)[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1>CCO>[CH2:8]([O:15][C:16](=[O:24])[NH:17][CH:18]([C:19]1[N:7]=[C:3]2[CH:4]=[CH:5][CH:6]=[N:1][N:2]2[CH:20]=1)[CH3:23])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1

Participants

4

Reactant 2

HCID 230373AminopyridazineHCID 73196234Benzyl (4-bromo-3-oxobutan-2-yl)carbamate

Product 1

HCID 67433032(1-Imidazo[1,2-b]pyridazin-2-yl-ethyl)-carbamic acid benzyl ester

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of pyridazin-3-ylamine (2 g, 21.05 mmol) and (3-bromo-1-methyl-2-oxopropyl)-carbamic acid benzyl ester (7.5 g, 25.26 mmol) in EtOH (25 mL) was heated to reflux overnight. After completion, the reaction mixture was cooled to rt. EtOH was removed in vacuo. The residue was dissolved in EtOAc. The organic layer was dried over sodium sulfate, filtered and concentrated in vacuo. The crude product was purified by column chromatography using silica gel (100-200 mesh) and 0-5% MeOH in DCM to provide (1-imidazo[1,2-b]pyridazin-2-yl-ethyl)-carbamic acid benzyl ester: LC-MS (ESI) m/z 297.3 [M+H]+.

Workup

  1. temperaturewas heated
  2. temperatureto reflux overnight
  3. customEtOH was removed in vacuo
  4. dissolutionThe residue was dissolved in EtOAc
  5. dry with materialThe organic layer was dried over sodium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe crude product was purified by column chromatography

Sources & evidence

ORD record
ord-39e76ec047ac4006adff339bc5247f70
Source dataset
uspto-grants-2013_11
Patent number
US08575183B2

Reaction notes

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