Sodium Carbonate → 2-(3,6-dihydro-2H-pyran-4-yl)-3-fluoropyrazine

HRID 473676Notes

Reaction equation

HRID 473676 reaction equation
[F:1][C:2]1[C:7](I)=[N:6][CH:5]=[CH:4][N:3]=1.[O:9]1[CH2:14][CH:13]=[C:12](B2OC(C)(C)C(C)(C)O2)[CH2:11][CH2:10]1.C(=O)([O-])[O-].[Na+].[Na+]>COCCOC.O>[O:9]1[CH2:10][CH:11]=[C:12]([C:7]2[C:2]([F:1])=[N:3][CH:4]=[CH:5][N:6]=2)[CH2:13][CH2:14]1

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 112180533,6-Dihydro-2H-pyran-4-boronic acid pinacol esterHCID 153696932-Fluoro-3-iodopyrazine

Product 1

HCID 593511782-(3,6-dihydro-2H-pyran-4-yl)-3-fluoropyrazine

Reagents, catalysts & solvents 2

HCID 962WaterSolvent2×HCID 80711,2-DimethoxyethaneSolvent

Conditions

Temperature
80 °C

Procedure

To a glass microwave vial was added 2-fluoro-3-iodopyrazine (1.6485 g, 7.36 mmol), 2-(3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2.319 g, 11.04 mmol), trans-dichlorobis(triphenylphosphine) palladium (II) (0.413 g, 0.589 mmol), and sodium carbonate (3.90 g, 36.8 mmol) in DME (19.63 mL) and water (4.91 mL) to stir at 80° C. overnight. The reaction mixture was diluted with water and extracted with dichloromethane. The organic extract was washed with water, sat NaCl, dried with magnesium sulfate, filtered, and concentrated. The crude product was adsorbed onto a plug of silica gel and chromatographed to provide 2-(3,6-dihydro-2H-pyran-4-yl)-3-fluoropyrazine. MS (ESI, pos. ion) m/z: 181.1.

Workup

  1. extractionextracted with dichloromethane
  2. extractionThe organic extract
  3. washwas washed with water
  4. dry with materialdried with magnesium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customchromatographed

Sources & evidence

ORD record
ord-e140bb1e7ece4d939448b0158274c58c
Source dataset
uspto-grants-2014_01
Patent number
US08637500B2

Reaction notes

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