Water → N-{5-[(2-{[(ethylamino)carbonyl]amino}imidazo[1,2-b]pyridazin-6-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamide

HRID 2391407Notes

Reaction equation

HRID 2391407 reaction equation
Cl.[NH2:2][C:3]1[N:4]=[C:5]2[CH:10]=[CH:9][C:8]([O:11][C:12]3[CH:13]=[CH:14][C:15]([CH3:28])=[C:16]([NH:18][C:19]([C:21]4[N:25]([CH3:26])[N:24]=[C:23]([CH3:27])[CH:22]=4)=[O:20])[CH:17]=3)=[N:7][N:6]2[CH:29]=1.[CH2:30]([N:32]=[C:33]=[O:34])[CH3:31].C(OCC)(=O)C.O1CCCC1.O>N1C=CC=CC=1>[CH2:30]([NH:32][C:33]([NH:2][C:3]1[N:4]=[C:5]2[CH:10]=[CH:9][C:8]([O:11][C:12]3[CH:13]=[CH:14][C:15]([CH3:28])=[C:16]([NH:18][C:19]([C:21]4[N:25]([CH3:26])[N:24]=[C:23]([CH3:27])[CH:22]=4)=[O:20])[CH:17]=3)=[N:7][N:6]2[CH:29]=1)=[O:34])[CH3:31]

Participants

6

Reactant 4

HCID 962WaterHCID 8022Ethyl isocyanateHCID 21939870Tetrahydrofuran ethyl acetateHCID 57505635N-{5-[(2-aminoimidazo[1,2-b]pyridazin-6-yl)oxy]-2-methylphenyl)-1,3-dimethyl-1H-pyrazole-5-carboxamide hydrochloride

Product 1

HCID 57505647N-{5-[(2-{[(ethylamino)carbonyl]amino}imidazo[1,2-b]pyridazin-6-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamideYield 74.3%

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

To a solution of N-{5-[(2-aminoimidazo[1,2-b]pyridazin-6-yl)oxy]-2-methylphenyl}-1,3-dimethyl-1H-pyrazole-5-carboxamide hydrochloride (200 mg, 0.48 mmol) in pyridine (3 mL) was added ethyl isocyanate (380 μL, 4.8 mmol), and the mixture was stirred at room temperature for 2 hr. Ethyl acetate/tetrahydrofuran and water were added to the reaction mixture, and the aqueous layer was extracted with ethyl acetate/tetrahydrofuran (×3). Combined organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and filtrated. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=30/70→100/0) to give the title compound (160 mg, 72%) as a pale-yellow solid.

Workup

  1. extractionthe aqueous layer was extracted with ethyl acetate/tetrahydrofuran (×3)
  2. washCombined organic layer was washed with saturated brine
  3. dry with materialdried over anhydrous sodium sulfate
  4. filtrationfiltrated
  5. concentrationThe filtrate was concentrated under reduced pressure
  6. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=30/70→100/0)

Sources & evidence

ORD record
ord-fa2f0d41ef524b18978151a8088ea759
Source dataset
uspto-grants-2012_09
Patent number
US08273741B2

Reaction notes

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