Potassium Acetate → 4-Methyl-5-oxo-6-(pyridin-3-ylamino)-4,5-dihydropyrazin-2-ylboronic acid

HRID 1021843Notes

Reaction equation

HRID 1021843 reaction equation
Br[C:2]1[N:3]=[C:4]([NH:10][C:11]2[CH:12]=[N:13][CH:14]=[CH:15][CH:16]=2)[C:5](=[O:9])[N:6]([CH3:8])[CH:7]=1.CC1(C)C(C)(C)[O:21][B:20](B2OC(C)(C)C(C)(C)O2)[O:19]1.C([O-])(=O)C.[K+]>[Pd].O1CCOCC1>[CH3:8][N:6]1[C:5](=[O:9])[C:4]([NH:10][C:11]2[CH:12]=[N:13][CH:14]=[CH:15][CH:16]=2)=[N:3][C:2]([B:20]([OH:21])[OH:19])=[CH:7]1

Participants

6

Reactant 3

HCID 517044Potassium AcetateHCID 2733548Bis(pinacolato)diboraneHCID 666133725-Bromo-1-methyl-3-(pyridin-3-ylamino)pyrazin-2(1H)-one

Product 1

HCID 866843344-Methyl-5-oxo-6-(pyridin-3-ylamino)-4,5-dihydropyrazin-2-ylboronic acidYield 58%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A 250-mL round-bottomed flask equipped with a reflux condenser was charged with 186a (800 mg, 2.86 mmol), 4,4,4′,4′,5,5,5′,5′-octamethyl-2,2′-bi(1,3,2-dioxaborolane) (2.18 g, 8.57 mmol), Pd (dppf) Cl2 (204 mg, 0.28 mmol), potassium acetate (560 mg, 5.71 mmol), and dioxane (60 mL). After bubbling nitrogen through the mixture for 30 minutes, it was stirred at 100° C. for 3 h under nitrogen. The mixture was cooled to room temperature and filtered. The filtrate was evaporated under reduce pressure. The residue solid was washed with petroleum ether (2×30 mL) to afford 186b (406 mg, 58%) as a brown solid. MS-ESI: [M+H]+ 247.3.

Workup

  1. customA 250-mL round-bottomed flask equipped with a reflux condenser
  2. customAfter bubbling nitrogen through the mixture for 30 minutes
  3. temperatureThe mixture was cooled to room temperature
  4. filtrationfiltered
  5. customThe filtrate was evaporated
  6. washThe residue solid was washed with petroleum ether (2×30 mL)

Sources & evidence

ORD record
ord-f513b3fbbac24600a751125e9c06aceb
Source dataset
uspto-grants-2014_05
Patent number
US08716274B2

Reaction notes

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