Methanol → Methyl 2,3-difluoro-4-methylbenzoate

HRID 919321ノート

反応式

HRID 919321 の反応式
[F:1][C:2]1[C:10]([F:11])=[C:9]([CH3:12])[CH:8]=[CH:7][C:3]=1[C:4]([OH:6])=[O:5].[CH3:13]O.S(=O)(=O)(O)O>>[CH3:13][O:5][C:4](=[O:6])[C:3]1[CH:7]=[CH:8][C:9]([CH3:12])=[C:10]([F:11])[C:2]=1[F:1]

参加物

4

反応物 3

HCID 887MethanolHCID 1118Sulfuric AcidHCID 27741412,3-Difluoro-4-methylbenzoic acid

生成物 1

HCID 55255640Methyl 2,3-difluoro-4-methylbenzoate収率 83.2%

実験手順

2,3-Difluoro-4-methyl-benzoic acid (10.0 g, 58.1 mmol) was dissolved in MeOH (200 mL, 6.0 mol) and sulfuric acid (1.00 mL, 19.0 mmol), and was heated at reflux overnight. The mixture was then cooled and concentrated under reduced pressure. The resulting residue was taken up in EtOAc and washed with saturated aqueous NaCl, dried over MgSO4, filtered and concentrated to yield 9.0 g of intermediate (7a) as a white solid. 1H-NMR (CDCl3): 7.61 (1H, t), 7.00 (1H, t), 3.93 (3H, s), 2.35 (3H, s).

後処理

  1. temperatureat reflux overnight
  2. temperatureThe mixture was then cooled
  3. concentrationconcentrated under reduced pressure
  4. washwashed with saturated aqueous NaCl
  5. dry with materialdried over MgSO4
  6. filtrationfiltered
  7. concentrationconcentrated

出典と根拠

ORDレコード
ord-edcb0b6000c943fd84317383df73ace3
出典データセット
uspto-grants-2016_03
特許番号
US09273008B2

反応ノート

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