1-Bromo-3-methylbutane → HCID 54365778, compound

HRID 846481Notes

Reaction equation

HRID 846481 reaction equation
[OH:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11])=[CH:4][C:3]=1[C:15]1[CH:20]=[C:19]([CH2:21][CH2:22][C:23]([O:25][CH2:26][CH3:27])=[O:24])[CH:18]=[CH:17][C:16]=1[OH:28].[CH2:29](Br)[CH2:30][CH:31]([CH3:33])[CH3:32].C(=O)([O-])[O-].[K+].[K+]>[Cu].CN(C=O)C>[CH2:29]([O:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][CH2:9][C:10]([O:12][CH2:13][CH3:14])=[O:11])=[CH:4][C:3]=1[C:15]1[CH:20]=[C:19]([CH2:21][CH2:22][C:23]([O:25][CH2:26][CH3:27])=[O:24])[CH:18]=[CH:17][C:16]=1[OH:28])[CH2:30][CH:31]([CH3:33])[CH3:32]

Participants

6

Reactant 3

HCID 78911-Bromo-3-methylbutaneHCID 11430Potassium CarbonateHCID 21734064HCID 21734064, compound

Product 1

HCID 54365778HCID 54365778, compoundYield 88%

Reagents, catalysts & solvents 2

HCID 23978CopperCatalystHCID 6228DimethylformamideSolvent

Procedure

To 5 ml of a DMF solution containing 200 mg (0.5181 mmol) of 2,2'-dihydroxy-5,5'-bis (2-ethoxycarbonylethyl) biphenyl and 646.5 μl (5.181 mmol) of isopentyl bromide, there were added 85.8 mg (0.6217 mmol) of anhydrous potassium carbonate and a small amount of copper powder and the resulting mixture was agitated overnight at room temperature. The reaction mixture was filtered by suction through Celite to remove the solid matter and the filtrate was washed with ethyl acetate. After the solvent in the filtrate was evaporated off under reduced pressure, the evaporated residue was dissolved in chloroform. This solution was washed with dilute hydrochloric acid, dilute aqueous sodium bicarbonate, water and aqueous sodium chloride solution in this sequence and was dried by adding anhydrous sodium sulfate. The residue obtained after the solvent had been evaporated off was purified by silica gel column chromatography (with 20 g of WAKO-gel C-200, eluent: toluene and toluene/ethyl acetate of 100/1 and 50/1) to obtain 8.2 mg (0.456 mmol, 88%) of 2-isopentyloxy-2'-hydroxy-5,5'-bis (2-ethoxycarbonylethyl) biphenyl as an oily product.

Workup

  1. filtrationThe reaction mixture was filtered by suction through Celite
  2. customto remove the solid matter
  3. washthe filtrate was washed with ethyl acetate
  4. customAfter the solvent in the filtrate was evaporated off under reduced pressure
  5. dissolutionthe evaporated residue was dissolved in chloroform
  6. washThis solution was washed with dilute hydrochloric acid, dilute aqueous sodium bicarbonate, water and aqueous sodium chloride solution in this sequence
  7. customwas dried
  8. additionby adding anhydrous sodium sulfate
  9. customThe residue obtained after the solvent
  10. customhad been evaporated off
  11. customwas purified by silica gel column chromatography (with 20 g of WAKO-gel C-200, eluent: toluene and toluene/ethyl acetate of 100/1 and 50/1)

Sources & evidence

ORD record
ord-4ba699835e3e4990a8061871dfcd6670
Source dataset
uspto-grants-1992_08
Patent number
US05136090

Reaction notes

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