p-Toluenesulfonic acid → Cis-4-(p-toluenesulfonyloxy)-2-[(1E,3E)-4-[4-(trifluoromethyl)phenyl]-1,3-butadien-1-yl]-1,3-dioxane

HRID 1601389ノート

反応式

HRID 1601389 の反応式
[C:1]1([CH3:16])[CH:6]=[CH:5][C:4]([S:7]([O:10][CH:11]([CH2:14]O)CO)(=[O:9])=[O:8])=[CH:3][CH:2]=1.[F:17][C:18]([F:32])([F:31])[C:19]1[CH:24]=[CH:23][C:22](/[CH:25]=[CH:26]/[CH:27]=[CH:28]/[CH:29]=[O:30])=[CH:21][CH:20]=1.C1(C)C=CC(S(O)(=O)=O)=CC=1.[C:44](=O)([O-])[OH:45].[Na+]>C(Cl)Cl>[C:1]1([CH3:16])[CH:2]=[CH:3][C:4]([S:7]([O:10][C@H:11]2[CH2:14][CH2:44][O:45][C@@H:29](/[CH:28]=[CH:27]/[CH:26]=[CH:25]/[C:22]3[CH:21]=[CH:20][C:19]([C:18]([F:31])([F:32])[F:17])=[CH:24][CH:23]=3)[O:30]2)(=[O:8])=[O:9])=[CH:5][CH:6]=1

参加物

6

反応物 4

HCID 6101p-Toluenesulfonic acidHCID 516892Sodium BicarbonateHCID 103772501,3-Dihydroxypropan-2-yl 4-methylbenzenesulfonateHCID 10609261(2E,4E)-5-(4-(trifluoromethyl)phenyl)penta-2,4-dienal

生成物 1

HCID 86583791Cis-4-(p-toluenesulfonyloxy)-2-[(1E,3E)-4-[4-(trifluoromethyl)phenyl]-1,3-butadien-1-yl]-1,3-dioxane収率 29%

試薬・触媒・溶媒 1

HCID 6344Dichloromethane溶媒

反応条件

温度
0 °C

実験手順

In 4.5 ml of methylene chloride were dissolved 200 mg (0.81 mmol) of 2-(p-toluenesulfonyloxy)-1,3-propanediol and 206 mg (0.91 mmol) of (2E,4E)-5-[4-(trifluoromethyl)phenyl]-2,4-pentadienal, and 15 mg of p-toluenesulfonic acid and 0.8 g of molecular sieves 4A were added to the solution, followed by stirring of the resulting mixture at 0° C. for 1 hour. An aqueous sodium hydrogencarbonate solution was added to the reaction mixture and the mixture was stirred for 10 minutes. Then, the molecular sieves were removed by filtration and the filtrate was extracted with methylene chloride. The oil obtained by evaporation of the solvent was separated by preparative thin layer chromatography of silica gel (developing solvent: 20% ethyl acetate-hexane) to obtain 107 mg (yield: 29%) of a trans isomer having less polarity and 153 mg (yield: 42%) of a cis isomer having higher polarity as an oil, respectively.

後処理

  1. additionwere added to the solution
  2. stirringthe mixture was stirred for 10 minutes
  3. customThen, the molecular sieves were removed by filtration
  4. extractionthe filtrate was extracted with methylene chloride
  5. customThe oil obtained by evaporation of the solvent
  6. customwas separated by preparative thin layer chromatography of silica gel (developing solvent: 20% ethyl acetate-hexane)
  7. customto obtain 107 mg (yield: 29%) of a trans isomer

出典と根拠

ORDレコード
ord-7c3865aba3e44a3787d0f3e198900462
出典データセット
uspto-grants-1999_11
特許番号
US05977152

反応ノート

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