1,4-Dibromobenzene → 4-(4-Bromo-phenyl)-1H-indole

HRID 982979ノート

反応式

HRID 982979 の反応式
CC1(C)C(C)(C)OB([C:9]2[CH:17]=[CH:16][CH:15]=[C:14]3[C:10]=2[CH:11]=[CH:12][NH:13]3)O1.[Br:19][C:20]1[CH:25]=[CH:24][C:23](Br)=[CH:22][CH:21]=1.[OH-].[Na+]>C1COCC1.[Pd].C(OCC)(=O)C>[Br:19][C:20]1[CH:25]=[CH:24][C:23]([C:9]2[CH:17]=[CH:16][CH:15]=[C:14]3[C:10]=2[CH:11]=[CH:12][NH:13]3)=[CH:22][CH:21]=1

参加物

7

反応物 3

HCID 78041,4-DibromobenzeneHCID 14798Sodium HydroxideHCID 113224711H-Indole-4-boronic acid, pinacol ester

生成物 1

HCID 225619344-(4-Bromo-phenyl)-1H-indole収率 55.1%

試薬・触媒・溶媒 3

HCID 23938Palladium触媒HCID 8028Tetrahydrofuran溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
70 °C

実験手順

To a mixture of 4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-indole (3, 2.43 g, 10 mmol), and 1,4-dibromobenzene (1.8 g, 50 mmol) in THF (34 mL)) were added Palladium catalyst Pd(PPh3)4 (347 mg, 0.3 mmol) and the freshly prepared sodium hydroxide solution (1.20 g, 30 mmol in 14 mL water). The system was degassed and then charged with nitrogen. The degas procedure was repeated for three times. The mixture was stirred under nitrogen at 70° C. oil bath for 15 hours. TLC showed the completion of the coupling reaction. The mixture was cooled to room temperature, diluted with ethyl acetate, and separated from water layer. The ethyl acetate solution was washed by brine, dried over Na2SO4, and concentrated. The crude product was purified by a silica gel column eluting with hexanes—EtOAc (9:1) to provide 1.50 g (55%) of the product 4-(4-bromo-phenyl)-1H-indole as a white solid.

後処理

  1. customThe system was degassed
  2. additioncharged with nitrogen
  3. customthe completion of the coupling reaction
  4. temperatureThe mixture was cooled to room temperature
  5. customseparated from water layer
  6. washThe ethyl acetate solution was washed by brine
  7. dry with materialdried over Na2SO4
  8. concentrationconcentrated
  9. customThe crude product was purified by a silica gel column
  10. washeluting with hexanes—EtOAc (9:1)

出典と根拠

ORDレコード
ord-5d4364ed143f477584d98e20d6f225db
出典データセット
uspto-grants-2005_03
特許番号
US06861418B2

反応ノート

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