Hydrochloric Acid → 4,4-Difluoro-1-[2-thienyl]-butane-1,3-dione

HRID 1721114

反応式

HRID 1721114 の反応式
[F:1][CH:2]([F:8])[C:3]([O:5]CC)=O.C[O-].[Na+].[C:12]([C:15]1[S:16][CH:17]=[CH:18][CH:19]=1)(=[O:14])[CH3:13].Cl>CCOCC>[F:8][CH:2]([F:1])[C:3](=[O:5])[CH2:13][C:12]([C:15]1[S:16][CH:17]=[CH:18][CH:19]=1)=[O:14]

参加物

6

反応物 4

HCID 313Hydrochloric AcidHCID 69202-AcetylthiopheneHCID 9961Ethyl difluoroacetateHCID 10942334Sodium Methoxide

生成物 1

HCID 170248414,4-Difluoro-1-[2-thienyl]-butane-1,3-dione

試薬・触媒・溶媒 1

HCID 3283Diethyl Ether溶媒

実験手順

Ethyl difluoroacetate (1.84 g,14.8 mmol) was placed in a 100 mL round bottom flask and dissolved in ether (5 mL). To the stirred solution was added 25 weight % sodium methoxide (3.39 g, 15.7 mmol) followed by 2-acetylthiophene (1.72 g,13.6 mmol). The reaction was stirred at room temperature overnight (15.67 hours), then treated with 3N HCl (8 mL). The organic layer was collected and washed with brine, dried over MgSO4, concentrated in vacuo, and recrystallized from methylene chloride/isooctane to give a brown solid ! 1.38 g, mp 78°-80° C., 50%). 1H NMR (CDCl3) 300 MHz 14.90 (br s, 1H), 7.80 (d, J=4.0 Hz, 1H), 7.71 (d, J=3.8 Hz, 1H), 7.19 (m, 1H), 6.41 (s, 1H), 6.04 (t, J=54.2 Hz, 1H); 19F NMR (CDCl3) 300 MHz: -126.98 (d); M+204.

後処理

  1. customThe organic layer was collected
  2. washwashed with brine
  3. dry with materialdried over MgSO4
  4. concentrationconcentrated in vacuo
  5. customrecrystallized from methylene chloride/isooctane
  6. customto give a brown solid

出典と根拠

ORDレコード
ord-d8b39c0f17d24b11b66ea775823f1a34
出典データセット
uspto-grants-1996_04
特許番号
US05508426

関連ノート

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