4-Bromotoluene → [1,1'-Biphenyl]-2,5-dicarboxylic acid, 4'-methyl-, 2,5-dimethyl ester

HRID 1707988

反応式

HRID 1707988 の反応式
Br[C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][CH:3]=1.[Li]C(C)(C)C.[CH3:14][O:15][C:16](=[O:28])[C:17]1[CH:26]=[CH:25][C:20]([C:21]([O:23][CH3:24])=[O:22])=[CH:19][C:18]=1Br>O1CCCC1.[Cl-].[Cl-].[Zn+2].Cl[Ni](Cl)([P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1>[CH3:14][O:15][C:16](=[O:28])[C:17]1[CH:26]=[CH:25][C:20]([C:21]([O:23][CH3:24])=[O:22])=[CH:19][C:18]=1[C:2]1[CH:7]=[CH:6][C:5]([CH3:8])=[CH:4][CH:3]=1

参加物

7

反応物 3

HCID 78054-BromotolueneHCID 87741Dimethyl 2-bromoterephthalateHCID 178418306HCID 178418306、化合物

生成物 1

HCID 105655[1,1'-Biphenyl]-2,5-dicarboxylic acid, 4'-methyl-, 2,5-dimethyl ester収率 85.3%

試薬・触媒・溶媒 3

HCID 3007855Zincchloride触媒HCID 178418751HCID 178418751、化合物触媒HCID 8028Tetrahydrofuran溶媒2 回

反応条件

温度
0 °C

実験手順

4-Bromotoluene (6 g) was dissolved in tetrahydrofuran (20 ml). To this solution at -78° C. under N2 was added over a ten minute period, 1.7M tBuLi (42 ml). After two hours at room temperature, the reaction mixture was cooled to 0° C. and 1M ZnCl2 (36 ml) was added over a ten minute period. After one-half hour at room temperature, bis(triphenylphosphine)nickel(II) chloride (1.32 g) was added followed by dimethyl-2-bromo-terephthalate (6 g) in tetrahydrofuran 920 ml) dropwise over a five minute period. The reaction mixture was stirred at room temperature for two hours. The tetrahydrofuran was removed under reduced pressure. The residue was treated with ethyl acetate and 1N HCl and the layers separated. The organic phase was washed with water, brine, dried over magnesium sulfate and evaporated which gave the crude product. Chromatography on silica gel using 5% hexanes/methylene chloride gave the desired product (5.33 g).

後処理

  1. additionTo this solution at -78° C. under N2 was added over a ten minute period
  2. waitAfter one-half hour at room temperature
  3. customdropwise over a five minute
  4. customThe tetrahydrofuran was removed under reduced pressure
  5. additionThe residue was treated with ethyl acetate and 1N HCl
  6. customthe layers separated
  7. washThe organic phase was washed with water, brine
  8. dry with materialdried over magnesium sulfate
  9. customevaporated which
  10. customgave the crude product

出典と根拠

ORDレコード
ord-be81bf75d1fc4acba37136f7bcfb08e4
出典データセット
uspto-grants-1994_10
特許番号
US05356889

関連ノート

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