Water → 5-(5-Methyl-3-phenyl-isoxazol-4-ylmethoxy)-pyrazine-2-carboxylic acid methyl ester

HRID 1435828Notes

Reaction equation

HRID 1435828 reaction equation
[CH3:1][C:2]1[O:6][N:5]=[C:4]([C:7]2[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=2)[C:3]=1[CH2:13][OH:14].[H-].[Na+].Cl[C:18]1[N:19]=[CH:20][C:21]([C:24]([O:26][CH3:27])=[O:25])=[N:22][CH:23]=1.O>C1COCC1>[CH3:27][O:26][C:24]([C:21]1[CH:20]=[N:19][C:18]([O:14][CH2:13][C:3]2[C:4]([C:7]3[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=3)=[N:5][O:6][C:2]=2[CH3:1])=[CH:23][N:22]=1)=[O:25]

Participants

6

Reactant 4

HCID 962WaterHCID 24758Sodium hydrideHCID 406081Methyl 5-chloropyrazine-2-carboxylateHCID 2776149(5-Methyl-3-phenyl-1,2-oxazol-4-yl)methanol

Product 1

HCID 426360595-(5-Methyl-3-phenyl-isoxazol-4-ylmethoxy)-pyrazine-2-carboxylic acid methyl ester

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a solution of (5-methyl-3-phenyl-isoxazol-4-yl)-methanol (1.24 g, 6.55 mmol) in THF (12 mL) was added sodium hydride (55% dispersion in mineral oil, 0.31 g, 7.2 mmol) at 0° C. The reaction mixture was stirred for 30 min while it was allowed to warm up to room temperature. Methyl 5-chloropyrazine-2-carboxylate (1.36 g, 7.86 mmol) was added and stirring was continued for 2 h. Water (10 mL) was added and the mixture was extracted with ethyl acetate (40 mL). The combined organic layers were washed with brine (10 mL) and dried over sodium sulfate. Concentration and purification of the residue by chromatography (SiO2, heptane:ethyl acetate=80:20 to 50:50, 1.00 g, 47%) which was obtained as a light yellow oil. MS: m/e=326.2 [M+H]+.

Workup

  1. stirringstirring
  2. waitwas continued for 2 h
  3. extractionthe mixture was extracted with ethyl acetate (40 mL)
  4. washThe combined organic layers were washed with brine (10 mL)
  5. dry with materialdried over sodium sulfate
  6. concentrationConcentration and purification of the residue by chromatography (SiO2, heptane:ethyl acetate=80:20 to 50:50, 1.00 g, 47%) which
  7. customwas obtained as a light yellow oil

Sources & evidence

ORD record
ord-f1913e7cbef34068ac984194ac575796
Source dataset
uspto-grants-2009_11
Patent number
US07618973B2

Reaction notes

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