Stannane, tributyl(1-ethoxyethenyl)- → 6-(1-Ethoxy-vinyl)-3-(1-methyl-1H-indazol-5-ylmethyl)-imidazo[1,2-b]pyridazine

HRID 1959664Notes

Reaction equation

HRID 1959664 reaction equation
Cl[C:2]1[CH:3]=[CH:4][C:5]2[N:6]([C:8]([CH2:11][C:12]3[CH:13]=[C:14]4[C:18](=[CH:19][CH:20]=3)[N:17]([CH3:21])[N:16]=[CH:15]4)=[CH:9][N:10]=2)[N:7]=1.C([Sn](CCCC)(CCCC)[C:27]([O:29][CH2:30][CH3:31])=[CH2:28])CCC>CN(C=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:30]([O:29][C:27]([C:2]1[CH:3]=[CH:4][C:5]2[N:6]([C:8]([CH2:11][C:12]3[CH:13]=[C:14]4[C:18](=[CH:19][CH:20]=3)[N:17]([CH3:21])[N:16]=[CH:15]4)=[CH:9][N:10]=2)[N:7]=1)=[CH2:28])[CH3:31]

Participants

5

Reactant 2

HCID 619414Stannane, tributyl(1-ethoxyethenyl)-HCID 581905366-Chloro-3-((1-methyl-1H-indazol-5-yl)methyl)imidazo[1,2-b]pyridazine

Product 1

HCID 581904976-(1-Ethoxy-vinyl)-3-(1-methyl-1H-indazol-5-ylmethyl)-imidazo[1,2-b]pyridazine

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 6228DimethylformamideSolvent

Conditions

Temperature
110 °C

Procedure

A suspension of 6-chloro-3-((1-methyl-1H-indazol-5-yl)methyl)imidazo[1,2-b]pyridazine (180.0 mg, 36% purity, 0.22 mmol), tributyl(1-ethoxyvinyl)stannane (94 mg, 0.26 mmol) and Pd(PPh3)4 (25.1 mg, 0.02 mmol) in 10 mL of DMF was flushed with nitrogen, then heated at 110° C. and stirred overnight. Solvent was removed under reduced pressure; the residue was diluted with DCM, washed sequentially with aqueous KF and water. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by flash chromatography (DCM:MeOH=20:1) to give the title compound containing some triphenylphosphine oxide impurity but used in the next step without further purification (49 mg, 47%, 70% purity). LCMS (method A): [MH]+=334, tR=5.71 min.

Workup

  1. customwas flushed with nitrogen
  2. customSolvent was removed under reduced pressure
  3. additionthe residue was diluted with DCM
  4. washwashed sequentially with aqueous KF and water
  5. dry with materialThe organic layer was dried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated in vacuo
  8. customThe crude product was purified by flash chromatography (DCM:MeOH=20:1)

Sources & evidence

ORD record
ord-009867ce0518418ba3a69534652a21f3
Source dataset
uspto-grants-2013_04
Patent number
US08410264B2

Reaction notes

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