Benzo(B)Thiophene → 1-Benzothien-2-yl(5-bromo-2-chlorophenyl)methanol

HRID 604711Notes

Reaction equation

HRID 604711 reaction equation
CCCCCC.[S:7]1[CH:11]=[CH:10][C:9]2[CH:12]=[CH:13][CH:14]=[CH:15][C:8]1=2.[Br:16][C:17]1[CH:18]=[CH:19][C:20]([Cl:25])=[C:21]([CH:24]=1)[CH:22]=[O:23].[Cl-].[NH4+]>O1CCCC1>[S:7]1[C:8]2[CH:15]=[CH:14][CH:13]=[CH:12][C:9]=2[CH:10]=[C:11]1[CH:22]([C:21]1[CH:24]=[C:17]([Br:16])[CH:18]=[CH:19][C:20]=1[Cl:25])[OH:23]

Participants

6

Reactant 4

HCID 7221Benzo(B)ThiopheneHCID 8058HexaneHCID 25517Ammonium ChlorideHCID 106089255-Bromo-2-chlorobenzaldehyde

Product 1

HCID 231033831-Benzothien-2-yl(5-bromo-2-chlorophenyl)methanolYield 71%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

1.6 M n-butylithium hexane solution (26.9 mL) was added to a mixture of benzo[b]thiophene (5.8 g, 0.043 mol) and tetrahydrofuran (58 mL) at −78° C. over 20 minutes. After stirred for 0.5 hours, the mixture was added with a tetrahydrofuran (50 mL) solution of 5-bromo-2-chlorobenzaldehyde (9.0 g, 0.041 mol) and stirred for further five minutes. The reaction mixture was warmed to room temperature. After the reaction mixture was added with a saturated ammonium chloride aqueous solution and extracted with ethyl acetate, the organic phase was 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=10:1) to obtain pale yellow oily (1-benzothien-2-yl)(5-bromo-2-chlorophenyl)methanol (10.3 g, 71%).

Workup

  1. stirringstirred for further five minutes
  2. extractionextracted with ethyl acetate
  3. washthe organic phase was washed with brine
  4. dry with materialdried with anhydrous magnesium sulfate
  5. filtrationAfter the desiccant was filtered off
  6. customthe residue obtained
  7. customby evaporating the solvent under reduced pressure
  8. customwas purified by silica gel column chromatography (hexane:ethyl acetate=10:1)

Sources & evidence

ORD record
ord-4cbfe4ff0d7d42128f5706414c81cdb5
Source dataset
uspto-grants-2011_03
Patent number
US07910619B2

Reaction notes

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