Potassium Fluoride → 4-(1-Ethoxyvinyl)-2-fluoro-3-pyridinecarbaldehyde

HRID 47354

反応式

HRID 47354 の反応式
[F:1][C:2]1[C:7]([CH:8]=[O:9])=[C:6](I)[CH:5]=[CH:4][N:3]=1.[CH2:11]([O:13][C:14]([Sn](CCCC)(CCCC)CCCC)=[CH2:15])[CH3:12].[F-].[K+]>O1CCOCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:14]([O:13][C:11]([C:6]1[CH:5]=[CH:4][N:3]=[C:2]([F:1])[C:7]=1[CH:8]=[O:9])=[CH2:12])[CH3:15]

参加物

6

反応物 3

HCID 522689Potassium FluorideHCID 619414Stannane, tributyl(1-ethoxyethenyl)-HCID 99923282-Fluoro-4-iodopyridine-3-carbaldehyde

生成物 1

HCID 227450184-(1-Ethoxyvinyl)-2-fluoro-3-pyridinecarbaldehyde

試薬・触媒・溶媒 2

HCID 178418397HCID 178418397、化合物触媒HCID 312751,4-Dioxane溶媒

実験手順

There are mixed in succession 8 g (31.9 mmol) of 2-fluoro-4-iodo-3-pyridinecarbaldehyde (described in J.O.C, 1993, 58, pp. 7832), 12.7 g (35.96 mmol) of 1-ethoxyvinyltributyltin and 740 mg of tetrakis(triphenylphosphine)palladium (2% molar) in 280 ml of dioxane. The reaction mixture is heated at reflux until the starting material has disappeared completely. After returning to room temperature a solution of potassium fluoride is added to the reaction mixture. Vigorous stirring is maintained for 10 minutes in order to cause precipitation of the tributyltin fluoride, which is filtered off. The filtrate is plunged into a sodium chloride solution. The aqueous phase is extracted 3 times with dichloromethane and then the organic phases are combined, dried over magnesium sulphate, concentrated and purified by chromatography over a silica column, using a dichloromethane/cyclohexane mixture (95/5) as eluant to yield the expected product.

後処理

  1. temperatureThe reaction mixture is heated
  2. temperatureat reflux until the starting material
  3. customAfter returning to room temperature
  4. additionis added to the reaction mixture
  5. temperatureis maintained for 10 minutes in order
  6. customprecipitation of the tributyltin fluoride, which
  7. filtrationis filtered off
  8. extractionThe aqueous phase is extracted 3 times with dichloromethane
  9. dry with materialdried over magnesium sulphate
  10. concentrationconcentrated
  11. custompurified by chromatography over a silica column

出典と根拠

ORDレコード
ord-b1911e1b043043799444f39d04e81d1e
出典データセット
uspto-grants-2004_03
特許番号
US06699876B2

関連ノート

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