1,2-Dibromoethane → 7-(2,2-dimethylpropyl)-3-(2-fluorophenyl)-6-(2-methyl-2H-1,2,4-triazol-3-ylmethoxy)-1,2,4-triazolo[4,3-b]pyridazine

HRID 1369439Notes

Reaction equation

HRID 1369439 reaction equation
BrCCBr.[CH2:5](I)[C:6]([CH3:9])([CH3:8])[CH3:7].Br[C:12]1[C:17]([O:18][CH2:19][C:20]2[N:21]([CH3:25])[N:22]=[CH:23][N:24]=2)=[N:16][N:15]2[C:26]([C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][C:30]=3[F:35])=[N:27][N:28]=[C:14]2[CH:13]=1.O1C=CC=C1P(C1OC=CC=1)C1OC=CC=1>CN(C=O)C.[Zn].C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd].O>[CH3:7][C:6]([CH3:9])([CH3:8])[CH2:5][C:12]1[C:17]([O:18][CH2:19][C:20]2[N:21]([CH3:25])[N:22]=[CH:23][N:24]=2)=[N:16][N:15]2[C:26]([C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][C:30]=3[F:35])=[N:27][N:28]=[C:14]2[CH:13]=1

Participants

9

Reactant 4

HCID 78391,2-DibromoethaneHCID 84953Propane, 1-iodo-2,2-dimethyl-HCID 521585Tris(furan-2-yl)phosphaneHCID 154861777-bromo-3-(2-fluorophenyl)-6-(2-methyl2H-1,2,4-triazol-3-ylmethoxy)-1,2,4-triazolo[4,3-b]pyridazine

Product 1

HCID 226098947-(2,2-dimethylpropyl)-3-(2-fluorophenyl)-6-(2-methyl-2H-1,2,4-triazol-3-ylmethoxy)-1,2,4-triazolo[4,3-b]pyridazineYield 58.1%

Reagents, catalysts & solvents 4

HCID 23994ZincCatalystHCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 962WaterSolventHCID 6228DimethylformamideSolvent2×

Procedure

1,2-Dibromoethane (0.03 ml, 10 mol %) was added to a stirred suspension of acid washed zinc dust (0.45 g, 7.0 mmol) in anhydrous DMF (3 ml) at 50° C. under nitrogen. After 5 min, neopentyl iodide (1.0 ml, 7.5 mmol) was added. The mixture was stirred for 2.5 h to give a grey-green milky solution. A mixture of 7-bromo-3-(2-fluorophenyl)-6-(2-methyl2H-1,2,4-triazol-3-ylmethoxy)-1,2,4-triazolo[4,3-b]pyridazine (0.35 g, 0.866 mmol), tri-2-furylphosphine (0.08 g. 40 mol %) and tris(dibenzylideneacetone)dipalladium(0) (0.04 g, 5 mol %) in anhydrous DMF (2 ml) was stirred at 50° C. under nitrogen for 15 min followed by addition of the solution of organozinc reagent via syringe. After 2.5 h, the mixture was cooled, poured into water (100 ml) and extracted with dichloromethane (2×50 ml). The extracts were dried (Na2SO4), filtered and concentrated. Flash column chromatography on silica gel, eluting with 2% methanol-dichloromethane, gave a brown solid that was recrystallised from ethyl acetate-diethyl ether to give 7-(2,2-dimethylpropyl)-3-(2-fluorophenyl)-6-(2-methyl-2H-1,2,4-triazol-3-ylmethoxy)-1,2,4-triazolo[4,3-b]pyridazine (0.199 g, 58%) as a beige powder; 1H NMR (360 MHz, CDCl3) δ0.96 (9H, s), 2.61 (2H, s), 3.83 (3H, s), 5.47 (2H, s), 7.28 (1H, dd, J=10 and 10 Hz), 7.36 (1H, dd, J=8 and 8 Hz), 7.56-7.62 (1H, m), 7.83 (1H, s), 7.86 (1H, dd, J=8 and 8 Hz), 7.90 (1H, s); MS (ES+) m/e 396 [MH]+. Anal. Found C, 59.66; H, 5.69; N. 24.41%. C20H22FN7O.0.4H2O requires C, 59.66; H, 5.71; N, 24.35%.

Workup

  1. customto give a grey-green milky solution
  2. stirringwas stirred at 50° C. under nitrogen for 15 min
  3. waitAfter 2.5 h
  4. temperaturethe mixture was cooled
  5. extractionextracted with dichloromethane (2×50 ml)
  6. dry with materialThe extracts were dried (Na2SO4)
  7. filtrationfiltered
  8. concentrationconcentrated
  9. washFlash column chromatography on silica gel, eluting with 2% methanol-dichloromethane
  10. customgave a brown solid that
  11. customwas recrystallised from ethyl acetate-diethyl ether

Sources & evidence

ORD record
ord-9c25b03da5ae4335a063db6d088f8120
Source dataset
uspto-grants-2003_06
Patent number
US06579875B1

Reaction notes

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