Cesium carbonate → 6-chloro-2-methyl-4-(5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)pyridazin-3(2H)-one

HRID 407800Notes

Reaction equation

HRID 407800 reaction equation
[CH3:1][N:2]1[CH2:7][CH2:6][N:5]2[N:8]=[C:9]([NH2:11])[CH:10]=[C:4]2[CH2:3]1.Br[C:13]1[C:14](=[O:21])[N:15]([CH3:20])[N:16]=[C:17]([Cl:19])[CH:18]=1.C(=O)([O-])[O-].[Cs+].[Cs+].CC1(C)C2C(=C(P(C3C=CC=CC=3)C3C=CC=CC=3)C=CC=2)OC2C(P(C3C=CC=CC=3)C3C=CC=CC=3)=CC=CC1=2>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].O1CCOCC1>[Cl:19][C:17]1[CH:18]=[C:13]([NH:11][C:9]2[CH:10]=[C:4]3[CH2:3][N:2]([CH3:1])[CH2:7][CH2:6][N:5]3[N:8]=2)[C:14](=[O:21])[N:15]([CH3:20])[N:16]=1

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 580439335-methyl-4H,5H,6H,7H-pyrazolo[1,5-a]pyrazin-2-amineHCID 592164744-Bromo-6-chloro-2-methyl-2,3-dihydropyridazin-3-one

Product 1

HCID 666346996-chloro-2-methyl-4-(5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)pyridazin-3(2H)-oneYield 60%

Reagents, catalysts & solvents 2

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 1,4-dioxane (30 mL), 5-methyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-amine 128b (1.70 g, 11.2 mmol), 4-bromo-6-chloro-2-methylpyridazin-3(2H)-one (2.68 g, 12.0 mmol), and cesium carbonate (7.30 g, 22.4 mmol). After bubbling nitrogen through the suspension for 30 minutes, Xantphos (0.59 g, 1.02 mmol) and tris(dibenzylideneacetone)dipalladium(0) (467 mg, 0.51 mmol) were added. The system was subjected to three cycles of vacuum/argon flush and heated at 90° C. for 2 h. It was then cooled to room temperature and filtered. The filtrate was evaporated in vacuo. The residue was purified by silica-gel column chromatography eluting with 30:1 dichloromethane/methanol to afford 153a (1.9 g, 60%) as a brown solid. LCMS: [M+H]+ 295.1

Workup

  1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter bubbling nitrogen through the suspension for 30 minutes
  3. customflush
  4. temperatureIt was then cooled to room temperature
  5. filtrationfiltered
  6. customThe filtrate was evaporated in vacuo
  7. customThe residue was purified by silica-gel column chromatography
  8. washeluting with 30:1 dichloromethane/methanol

Sources & evidence

ORD record
ord-992bd8d4466b4b8dad3d1b5ada20a360
Source dataset
uspto-grants-2014_06
Patent number
US08754077B2

Reaction notes

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