Cesium carbonate → 3-(5-acetyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)-5-bromo-1-methylpyridin-2(1H)-one

HRID 1918809Notes

Reaction equation

HRID 1918809 reaction equation
[NH2:1][C:2]1[CH:13]=[C:5]2[CH2:6][N:7]([C:10](=[O:12])[CH3:11])[CH2:8][CH2:9][N:4]2[N:3]=1.Br[C:15]1[C:16](=[O:23])[N:17]([CH3:22])[CH:18]=[C:19]([Br:21])[CH:20]=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>O1CCOCC1.[Pd].[Pd].C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.C(=CC(C=CC1C=CC=CC=1)=O)C1C=CC=CC=1.CO.CCOCC.CCOC(C)=O.O>[C:10]([N:7]1[CH2:8][CH2:9][N:4]2[N:3]=[C:2]([NH:1][C:15]3[C:16](=[O:23])[N:17]([CH3:22])[CH:18]=[C:19]([Br:21])[CH:20]=3)[CH:13]=[C:5]2[CH2:6]1)(=[O:12])[CH3:11]

Participants

11

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 580440081-(2-amino-6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl)ethanone

Product 1

HCID 580440563-(5-acetyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)-5-bromo-1-methylpyridin-2(1H)-oneYield 41%

Reagents, catalysts & solvents 6

HCID 9832798Tris(dibenzylideneacetone) dipalladiumCatalystHCID 887MethanolSolventHCID 962WaterSolventHCID 3283Diethyl EtherSolventHCID 8857Ethyl AcetateSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A sealed tube was equipped with a magnetic stirrer and charged with 1-(2-amino-6,7-dihydropyrazolo[1,5-a]pyrazin-5(4H)-yl)ethanone 108c (860 mg, 4.8 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (1.8 g, 6.7 mmol), and cesium carbonate (3.4 g, 10.5 mmol) in 1,4-dioxane (67 mL). After bubbling nitrogen through the solution for 30 min, Xantphos (330 mg, 0.6 mmol) and tris(dibenzylideneacetone) dipalladium(0) (300 mg, 0.3 mmol) were added, and the reaction mixture was heated to 100° C. for 16 h. After this time, H2O (50 mL) and EtOAc (50 mL) were added. The aqueous layer was separated and extracted with EtOAc (2×50 mL). The combined organic extracts were washed with brine (100 mL) and dried over sodium sulfate. The resulting residue was purified by column chromatography eluting with a gradient of CH2Cl2-60:35:5 CH2Cl2:Et2O:MeOH to afford a 41% yield (720 mg) of 3-(5-acetyl-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazin-2-ylamino)-5-bromo-1-methylpyridin-2(1H)-one 108d.

Workup

  1. customA sealed tube was equipped with a magnetic stirrer
  2. customAfter bubbling nitrogen through the solution for 30 min
  3. customThe aqueous layer was separated
  4. extractionextracted with EtOAc (2×50 mL)
  5. washThe combined organic extracts were washed with brine (100 mL)
  6. dry with materialdried over sodium sulfate
  7. customThe resulting residue was purified by column chromatography
  8. washeluting with a gradient of CH2Cl2-60:35:5 CH2Cl2

Sources & evidence

ORD record
ord-daa99a47890742ada9ed6a35a1765394
Source dataset
uspto-grants-2013_12
Patent number
US08618107B2

Reaction notes

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