2-Bromo-4,6-dimethylaniline → N-(2-Bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl) dimethylsilanamine

HRID 1922322Notes

Reaction equation

HRID 1922322 reaction equation
[Br:1][C:2]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH3:10])[C:3]=1[NH2:4].[Li]CCCC.Cl[Si:17]([CH:20]1[C:24]2[S:25][CH:26]=[CH:27][C:23]=2[C:22]([CH3:28])=[C:21]1[CH3:29])([CH3:19])[CH3:18]>C1COCC1>[Br:1][C:2]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH3:10])[C:3]=1[NH:4][Si:17]([CH:20]1[C:24]2[S:25][CH:26]=[CH:27][C:23]=2[C:22]([CH3:28])=[C:21]1[CH3:29])([CH3:18])[CH3:19]

Participants

5

Reactant 3

HCID 1705792-Bromo-4,6-dimethylanilineHCID 58526148Chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilaneHCID 178418339Butyllithium

Product 1

HCID 58526146N-(2-Bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl) dimethylsilanamine

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

Under an argon atmosphere, to a solution of 14.8 g (74.2 mmol) of 2-bromo-4,6-dimethylaniline in 200 ml of THF, 29.7 ml of 2.5 M (74.2 mmol) nBuLi in hexanes was added at −80° C. This mixture was warmed for ca. 1 hour to ambient temperature. Then, the resulting solution was added dropwise over ca. 1 hour, while vigorously stirring, to a solution of 18.0 g (74.2 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 100 ml of THF. The resulting mixture was stirred overnight at ambient temperature, and then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 168-172° C./0.2 mm Hg. The product crystallizes slowly at ambient temperature. Yield 16.5 g (55%).

Workup

  1. temperatureThis mixture was warmed for ca. 1 hour to ambient temperature
  2. additionThen, the resulting solution was added dropwise over ca. 1 hour
  3. customevaporated to dryness
  4. additionTo the residue, 150 ml of toluene was added
  5. filtrationThis mixture was filtered through a glass frit (G4)
  6. customThe filtrate was evaporated to dryness
  7. distillationFractional distillation
  8. customgave a yellow liquid, bp 168-172° C./0.2 mm Hg
  9. customThe product crystallizes slowly at ambient temperature

Sources & evidence

ORD record
ord-8009e31e0c9f4b96aee4613e9ea983d1
Source dataset
uspto-grants-2012_05
Patent number
US08173828B2

Reaction notes

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