Sodium hydride → Ethyl 5-{[3-chloro-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl]methyl}pyrazine-2-carboxylate

HRID 1832031Notes

Reaction equation

HRID 1832031 reaction equation
[Cl:1][C:2]1[C:3](=[O:19])[NH:4][C:5]([CH3:18])=[CH:6][C:7]=1[O:8][CH2:9][C:10]1[CH:15]=[CH:14][C:13]([F:16])=[CH:12][C:11]=1[F:17].Br[CH2:21][C:22]1[N:23]=[CH:24][C:25]([C:28]([O:30][CH2:31][CH3:32])=[O:29])=[N:26][CH:27]=1.[H-].[Na+]>C1COCC1>[Cl:1][C:2]1[C:3](=[O:19])[N:4]([CH2:21][C:22]2[N:23]=[CH:24][C:25]([C:28]([O:30][CH2:31][CH3:32])=[O:29])=[N:26][CH:27]=2)[C:5]([CH3:18])=[CH:6][C:7]=1[O:8][CH2:9][C:10]1[CH:15]=[CH:14][C:13]([F:16])=[CH:12][C:11]=1[F:17]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 22050280Ethyl 5-(bromomethyl)pyrazine-2-carboxylateHCID 22051050HCID 22051050, compound

Product 1

HCID 22050532Ethyl 5-{[3-chloro-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl]methyl}pyrazine-2-carboxylate

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Conditions

Temperature
60 °C

Procedure

To a mixture of 3-chloro-4-[(2,4-difluorobenzyl)oxy]-6-methylpyridin-2(1H)-one (0.59 g, 2.07 mmol) and ethyl 5-(bromomethyl)pyrazine-2-carboxylate (0.62 g, 2.4 mmol) in THF (15 mL) was added NaH (0.06 g, 2.4 mmol). The reaction stirred at 60° C. for 3.5 hours. The solvent was removed under reduced pressure and the residue was partitioned over dichloromethane and citric acid (5%). The organic extracts were washed with water and dried over Na2SO4 (anhydrous). The organic extracts were concentrated and the residue was purified by flash column chromatography (100% ethyl acetate). The appropriate fractions were combined and concentrated under reduced pressure to remove solvent. 1H NMR (CD3OD, 400 MHz) δ 9.11 (d, 1H, J=1.6 Hz), 8.77 (s, 1H), 7.52 (m, 1H), 7.02 (m, 2H), 6.57 (s, 1H), 5.53 (s, 2H), 5.30 (s, 2H), 4.49 (q, 2H), 2.52 (s, 3H), 1.39 (t, 3H, J=7.2 Hz); ES-HRMS m/z 450.1045 (M+H calculated for C21H19N3O4ClF2 requires 450.01027).

Workup

  1. customThe solvent was removed under reduced pressure
  2. customthe residue was partitioned over dichloromethane and citric acid (5%)
  3. washThe organic extracts were washed with water
  4. dry with materialdried over Na2SO4 (anhydrous)
  5. concentrationThe organic extracts were concentrated
  6. customthe residue was purified by flash column chromatography (100% ethyl acetate)
  7. concentrationconcentrated under reduced pressure
  8. customto remove solvent

Sources & evidence

ORD record
ord-5066b741062d4bf1ba56b269fe444825
Source dataset
uspto-grants-2006_06
Patent number
US07067540B2

Reaction notes

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