Boron trifluoride etherate → 2-(5-Bromo-2-chlorobenzyl)-1-benzothiophene

HRID 909776Notes

Reaction equation

HRID 909776 reaction equation
[SiH](CC)(CC)CC.B(F)(F)F.CCOCC.[S:17]1[C:21]2[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=2[CH:19]=[C:18]1[CH:26]([C:28]1[CH:33]=[C:32]([Br:34])[CH:31]=[CH:30][C:29]=1[Cl:35])O.C(=O)(O)[O-].[Na+]>C(Cl)(Cl)Cl>[Br:34][C:32]1[CH:31]=[CH:30][C:29]([Cl:35])=[C:28]([CH:33]=1)[CH2:26][C:18]1[S:17][C:21]2[CH:22]=[CH:23][CH:24]=[CH:25][C:20]=2[CH:19]=1

Participants

6

Reactant 4

HCID 8000Boron trifluoride etherateHCID 12052TriethylsilaneHCID 516892Sodium BicarbonateHCID 231033831-Benzothien-2-yl(5-bromo-2-chlorophenyl)methanol

Product 1

HCID 581784582-(5-Bromo-2-chlorobenzyl)-1-benzothiopheneYield 56.6%

Reagents, catalysts & solvents 1

HCID 6212ChloroformSolvent

Procedure

Then, Et3SiH (9.2 mL, 0.058 mol) and BF3.Et2O (3.6 mL, 0.029 mol) were added sequentially to a chloroform (110 mL) solution of (1-benzothien-2-yl)(5-bromo-2-chlorophenyl)methanol (10.2 g, 0.0288 mol) at −15° C. The reaction mixture was warmed to room temperature and stirred at the temperature for ten hours. After the reaction mixture was added with a saturated sodium bicarbonate aqueous solution, the organic phase was separated, washed with brine and then dried with anhydrous magnesium sulfate. After the desiccant was filtered off, the residue obtained by evaporating the solvent under reduced pressure was purified by silica gel column chromatography (hexane:ethyl acetate=60:1) to obtain a colorless oily title compound (5.5 g, 56%).

Workup

  1. customthe organic phase was separated
  2. washwashed with brine
  3. dry with materialdried with anhydrous magnesium sulfate
  4. filtrationAfter the desiccant was filtered off
  5. customthe residue obtained
  6. customby evaporating the solvent under reduced pressure
  7. customwas purified by silica gel column chromatography (hexane:ethyl acetate=60:1)

Sources & evidence

ORD record
ord-33894529788444bd87a284fc54f9c734
Source dataset
uspto-grants-2011_09
Patent number
US08017792B2

Reaction notes

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