Trifluoroacetic anhydride → (3-Bromo-5-fluoro-4-methyl-2-pyridyl)methanol

HRID 468948ノート

反応式

HRID 468948 の反応式
FC(F)(F)C(O[C:6](=[O:11])[C:7](F)(F)F)=O.[Br:14][C:15]1C(C)=[N+:17]([O-])[CH:18]=[C:19]([F:22])[C:20]=1[CH3:21]>C(Cl)Cl.C(OCC)(=O)C>[Br:14][C:15]1[C:7]([CH2:6][OH:11])=[N:17][CH:18]=[C:19]([F:22])[C:20]=1[CH3:21]

参加物

5

反応物 2

HCID 9845Trifluoroacetic anhydrideHCID 679750773-Bromo-5-fluoro-2,4-dimethylpyridine 1-oxide

生成物 1

HCID 67974745(3-Bromo-5-fluoro-4-methyl-2-pyridyl)methanol収率 68.2%

試薬・触媒・溶媒 2

HCID 6344Dichloromethane溶媒HCID 8857Ethyl Acetate溶媒

実験手順

Trifluoroacetic anhydride (0.35 mL, 2.5 mmol) was added dropwise to a solution of 3-bromo-5-fluoro-2,4-dimethylpyridine 1-oxide (220 mg; 1.0 mmol) in DCM (3 mL). The reaction mixture was stirred at room temperature overnight and then diluted with ethyl acetate (50 mL) and washed with saturated aqueous sodium bicarbonate solution (20 mL). The organic layer was separated, dried over sodium sulfate, filtered and concentrated in vacuo to provide a residue that was purified by flash chromatography (4 g, Silica, 0-100% ethyl acetate in heptane). Desired fractions were combined and evaporated in vacuo to afford the title compound as a pale yellow oil (150 mg, 68%), which was used in the next step without further purification.

後処理

  1. washwashed with saturated aqueous sodium bicarbonate solution (20 mL)
  2. customThe organic layer was separated
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated in vacuo
  6. customto provide a residue that
  7. customwas purified by flash chromatography (4 g, Silica, 0-100% ethyl acetate in heptane)
  8. customevaporated in vacuo

出典と根拠

ORDレコード
ord-00c81742f5db4f639c168ab2934dd2a6
出典データセット
uspto-grants-2014_01
特許番号
US08623889B2

反応ノート

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