Cesium carbonate → 2-(5-Bromo-1-methyl-2-oxo-1,2-dihydropyridin-3-ylamino)-5-methyl-4,5-dihydropyrazolo[1,5-a]pyrazin-6(7H)-one

HRID 1412066Notes

Reaction equation

HRID 1412066 reaction equation
[NH2:1][C:2]1[CH:12]=[C:5]2[CH2:6][N:7]([CH3:11])[C:8](=[O:10])[CH2:9][N:4]2[N:3]=1.Br[C:14]1[C:15](=[O:22])[N:16]([CH3:21])[CH:17]=[C:18]([Br:20])[CH:19]=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>[Br:20][C:18]1[CH:19]=[C:14]([NH:1][C:2]2[CH:12]=[C:5]3[CH2:6][N:7]([CH3:11])[C:8](=[O:10])[CH2:9][N:4]3[N:3]=2)[C:15](=[O:22])[N:16]([CH3:21])[CH:17]=1

Participants

7

Reactant 4

HCID 10796Cesium carbonateHCID 6360441,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine)HCID 36143503,5-Dibromo-1-methylpyridin-2(1H)-oneHCID 866840322-Amino-5-methyl-4,5-dihydropyrazolo[1,5-a]pyrazin-6(7H)-one

Product 1

HCID 866840332-(5-Bromo-1-methyl-2-oxo-1,2-dihydropyridin-3-ylamino)-5-methyl-4,5-dihydropyrazolo[1,5-a]pyrazin-6(7H)-oneYield 61.5%

Reagents, catalysts & solvents 2

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

Procedure

A 100-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 313d (300 mg, 1.8 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (482 mg, 1.8 mmol), cesium carbonate (1.17 g, 3.6 mmol), and 1,4-dioxane (20 mL). After bubbling nitrogen through the suspension for 10 minutes, xantphos (104 mg, 0.18 mmol) and tris(dibenzylideneacetone)dipalladium(0) (82 mg, 0.090 mmol) were added. The system was subjected to three cycles of vacuum/argon flush and heated at reflux for 5 h. It was then cooled to room temperature and filtered. The solid was washed with dichloromethane (2×30 m). The combined filtrate was concentrated under reduced pressure. The residue was purified by silica-gel column chromatography eluting with dichloromethane/methanol (80/1 to 30/1) to afford 313e (390 mg, 61%) as a yellow solid.

Workup

  1. customA 100-mL round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter bubbling nitrogen through the suspension for 10 minutes
  3. customflush
  4. temperatureheated
  5. temperatureat reflux for 5 h
  6. filtrationfiltered
  7. washThe solid was washed with dichloromethane (2×30 m)
  8. concentrationThe combined filtrate was concentrated under reduced pressure
  9. customThe residue was purified by silica-gel column chromatography
  10. washeluting with dichloromethane/methanol (80/1 to 30/1)

Sources & evidence

ORD record
ord-26c5471e9fec4d668e9980e68a9913fc
Source dataset
uspto-grants-2014_12
Patent number
US08921353B2

Reaction notes

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