Acetyl chloride → 1-(4'-t-Butyldimethylsilyloxy-3'-methoxyphenyl)-1-hexene-3,5-dione

HRID 2352638ノート

反応式

HRID 2352638 の反応式
[Si:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH:15]=[CH:16][C:17](=[O:19])[CH3:18])=[CH:11][C:10]=1[O:20][CH3:21])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C([N-]C(C)C)(C)C.[Li+].[C:30](Cl)(=[O:32])[CH3:31].C(OCC)C.CCCCCC>C1COCC1>[Si:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH:15]=[CH:16][C:17](=[O:19])[CH2:18][C:30](=[O:32])[CH3:31])=[CH:11][C:10]=1[O:20][CH3:21])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]

参加物

6

反応物 4

HCID 6367Acetyl chlorideHCID 2724682Lithium diisopropylamideHCID 21584099Diethylether hexaneHCID 545292101-(4'-t-Butyldimethylsilyloxy-3'-methoxyphenyl)-1-butene-3-one

生成物 1

HCID 541564831-(4'-t-Butyldimethylsilyloxy-3'-methoxyphenyl)-1-hexene-3,5-dione収率 34.3%

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
-78 °C

実験手順

A solution of 1-(4'-t-butyldimethylsilyloxy-3'-methoxyphenyl)-1-butene-3-one (12.8 g, 41.8 mmol) in THF (50 mL) is cooled to -78° C. under an argon atmosphere. Lithium di-isopropyl amide (83.5 mmol, in 50 mL THF) is slowly added to the reaction mixture. The reaction is stirred at -78° C. for 30 minutes. Acetyl chloride (16.4 g, 209 mmol) dissolved in THF (20 mL) is then added to the reaction over a 30 minute period. The reaction is quenched with aqueous HCl. The layers are separated, and the aqueous layer is washed with ethyl acetate. The combined organic layers are washed with saturated aqueous sodium bicarbonate, dried over MgSO4, and evaporated to give a red oil. Flash chromatography (ethyl ether/hexane 2:8) afford 5.0 g (34%) of 1-(4'-t-butyldimethylsilyloxy-3'-methoxyphenyl)-1-hexene-3,5-dione, mp=81°-85° C.

後処理

  1. additionis then added to the reaction over a 30 minute period
  2. customThe reaction is quenched with aqueous HCl
  3. customThe layers are separated
  4. washthe aqueous layer is washed with ethyl acetate
  5. washThe combined organic layers are washed with saturated aqueous sodium bicarbonate
  6. dry with materialdried over MgSO4
  7. customevaporated
  8. customto give a red oil

出典と根拠

ORDレコード
ord-78cb869710eb4e98b9f0a12df0cbeb34
出典データセット
uspto-grants-1989_10
特許番号
US04877881

反応ノート

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