Cesium carbonate → 5-Bromo-1-methyl-3-(5-methyloxazol-2-ylamino)pyridin-2(1H)-one

HRID 407689Notes

Reaction equation

HRID 407689 reaction equation
[CH3:1][C:2]1[O:6][C:5]([NH2:7])=[N:4][CH:3]=1.Br[C:9]1[C:10](=[O:17])[N:11]([CH3:16])[CH:12]=[C:13]([Br:15])[CH:14]=1.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.C([O-])([O-])=O.[Cs+].[Cs+]>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:15][C:13]1[CH:14]=[C:9]([NH:7][C:5]2[O:6][C:2]([CH3:1])=[CH:3][N:4]=2)[C:10](=[O:17])[N:11]([CH3:16])[CH:12]=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 124951335-Methyl-1,3-oxazol-2-amine

Product 1

HCID 866839665-Bromo-1-methyl-3-(5-methyloxazol-2-ylamino)pyridin-2(1H)-oneYield 88%

Reagents, catalysts & solvents 2

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

Conditions

Temperature
92 °C

Procedure

A 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser was charged with 5-methyloxazol-2-amine (276 mg, 2.82 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (753 mg, 2.82 mmol), tris-(dibenzylideneacetone)dipalladium(0) (256 mg, 0.28 mmol), XantPhos (324 mg, 0.56 mmol), Cs2CO3 (1.8 g, 5.64 mmol), and 1,4-dioxane (30 mL). After three cycles of vacuum/argon flush, the mixture was heated at 92° C. for 3 hrs. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the resulting residue was purified by silica-gel column chromatography eluting with 100:1 dichloromethane/methanol to afford 125a as a white solid (702 mg, 88%). MS-ESI: [M+H]+ 284.1.

Workup

  1. customA 100-mL single-neck round-bottomed flask equipped with a magnetic stirrer and a reflux condenser
  2. customAfter three cycles of vacuum/argon flush
  3. temperatureIt was then cooled to room temperature
  4. filtrationfiltered
  5. concentrationThe filtrate was concentrated under reduced pressure
  6. customthe resulting residue was purified by silica-gel column chromatography
  7. washeluting with 100:1 dichloromethane/methanol

Sources & evidence

ORD record
ord-ac62a2eb66e4498588f631acebdc7529
Source dataset
uspto-grants-2014_06
Patent number
US08754077B2

Reaction notes

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