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Lithium hexamethyldisilazane → 2-(4-Bromo-2,6-dimethylphenyl)-5-[hydroxy(tetrahydropyran-4-yl)methyl]-3-methoxycyclopent-2-enone

HRID 514200
ノート
印刷プレビュー

反応式

HRID 514200 の反応式
[Br:1][C:2]1[CH:7]=[C:6]([CH3:8])[C:5]([C:9]2[C:10](=[O:16])[CH2:11][CH2:12][C:13]=2[O:14][CH3:15])=[C:4]([CH3:17])[CH:3]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[CH2:28]1[CH:33]([CH:34]=[O:35])[CH2:32][CH2:31][O:30][CH2:29]1>O1CCCC1>[Br:1][C:2]1[CH:3]=[C:4]([CH3:17])[C:5]([C:9]2[C:10](=[O:16])[CH:11]([CH:34]([OH:35])[CH:33]3[CH2:32][CH2:31][O:30][CH2:29][CH2:28]3)[CH2:12][C:13]=2[O:14][CH3:15])=[C:6]([CH3:8])[CH:7]=1
参加物反応条件実験手順後処理出典と根拠反応ノート

参加物

5

反応物 3

HCID 2733832Lithium hexamethyldisilazaneHCID 9964078Tetrahydro-2H-pyran-4-carboxaldehydeHCID 668681542-(4-Bromo-2,6-dimethylphenyl)-3-methoxy-cyclopent-2-enone

生成物 1

HCID 896013392-(4-Bromo-2,6-dimethylphenyl)-5-[hydroxy(tetrahydropyran-4-yl)methyl]-3-methoxycyclopent-2-enone

試薬・触媒・溶媒 1

HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
-75 °C

実験手順

To a solution of 2-(4-bromo-2,6-dimethylphenyl)-3-methoxycyclopent-2-enone (7.5 g, 26.0 mmol) in anhydrous tetrahydrofuran (70 ml) under a nitrogen atmosphere is added lithium bis(trimethylsilyl)amide (44.6 ml, 31.0 mmol, 0.7M in tetrahydrofuran) dropwise at −75°C. After stirring for 40 minutes at this temperature a second solution of tetrahydropyranyl-4-carboxaldehyde (5.90 g, 52.0 mmol) in tetrahydrofuran (70 ml) is added over 20 minutes, and the resulting solution is stirred at −75°C. for 2 hours. After warming to room temperature the mixture is stirred for a further 2 hours, then is quenched with ice cold water (100 ml) and extracted with ethyl acetate (3×150 ml). Organics are combined, dried over sodium sulphate, filtered and the filtrate is concentrated in vacuo to afford 2-(4-bromo-2,6-dimethylphenyl)-5-[hydroxy(tetrahydropyran-4-yl)methyl]-3-methoxycyclopent-2-enone. This material is used directly in the next step without further purification.

後処理

  1. additionis added over 20 minutes
  2. temperatureAfter warming to room temperature the mixture
  3. stirringis stirred for a further 2 hours
  4. customis quenched with ice cold water (100 ml)
  5. extractionextracted with ethyl acetate (3×150 ml)
  6. dry with materialdried over sodium sulphate
  7. filtrationfiltered
  8. concentrationthe filtrate is concentrated in vacuo

出典と根拠

ORDレコード
ord-1485ee43c98d429bb6d928d729131d75
出典データセット
uspto-grants-2015_08
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US09107415B2

反応ノート

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