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Cesium carbonate → 5-Bromo-3-(5-ethylisoxazol-3-ylamino)-1-methylpyridin-2(1H)-one

HRID 407817
Notes
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Reaction equation

HRID 407817 reaction equation
[CH2:1]([C:3]1[O:7][N:6]=[C:5]([NH2:8])[CH:4]=1)[CH3:2].Br[C:10]1[C:11](=[O:18])[N:12]([CH3:17])[CH:13]=[C:14]([Br:16])[CH:15]=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:16][C:14]1[CH:15]=[C:10]([NH:8][C:5]2[CH:4]=[C:3]([CH2:1][CH3:2])[O:7][N:6]=2)[C:11](=[O:18])[N:12]([CH3:17])[CH:13]=1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

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 50943815-Ethyl-1,2-oxazol-3-amine

Product 1

HCID 866840775-Bromo-3-(5-ethylisoxazol-3-ylamino)-1-methylpyridin-2(1H)-oneYield 45.1%

Reagents, catalysts & solvents

2
HCID 9811564Bis(dibenzylideneacetone)palladiumCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A 50-mL single-neck round-bottomed flask equipped with a magnetic stirred and a reflux condenser was charged with 5-ethylisoxazol-3-amine (250 mg, 2.23 mmol), 3,5-dibromo-1-methylpyridin-2(1H)-one (893 mg, 3.35 mmol), Pd2(dba)3 (102 mg, 0.112 mmol), Xantphos (129 mg, 0.223 mmol), Cs2CO3 (1.45 g, 4.46 mmol), and dioxane (20 mL). The system was subjected to three cycles of vacuum/nitrogen flush and heated at 100° C. under N2 protection for 3 h. Analysis of the reaction mixture by LCMS showed complete conversion to the desired product. It was then cooled to room temperature and filtered. The filtrate was concentrated under reduced pressure and the residue was purified by reverse-phase prep-HPLC to afford 158a (300 mg, 45%) as a white solid. MS-ESI: [M+H]+ 297.8

Workup

  1. customA 50-mL single-neck round-bottomed flask equipped with
  2. customflush
  3. temperatureIt was then cooled to room temperature
  4. filtrationfiltered
  5. concentrationThe filtrate was concentrated under reduced pressure
  6. customthe residue was purified by reverse-phase prep-HPLC

Sources & evidence

ORD record
ord-c6deab1a733a40f885cac088f13bd7f2
Source dataset
uspto-grants-2014_06
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08754077B2

Reaction notes

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On this pageParticipantsConditionsProcedureWorkupSources & evidenceReaction notes