Imidazole → [1-Benzothien-2-yl(5-bromo-2-chloro phenyl)methoxy](tert-butyl) dimethylsilane

HRID 501904Notes

Reaction equation

HRID 501904 reaction equation
N1C=CN=C1.[C:6]([Si:10]([CH3:13])([CH3:12])Cl)([CH3:9])([CH3:8])[CH3:7].[S:14]1[C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][C:17]=2[CH:16]=[C:15]1[CH:23]([C:25]1[CH:30]=[C:29]([Br:31])[CH:28]=[CH:27][C:26]=1[Cl:32])[OH:24].O>CN(C)C=O>[S:14]1[C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][C:17]=2[CH:16]=[C:15]1[CH:23]([C:25]1[CH:30]=[C:29]([Br:31])[CH:28]=[CH:27][C:26]=1[Cl:32])[O:24][Si:10]([C:6]([CH3:9])([CH3:8])[CH3:7])([CH3:13])[CH3:12]

Participants

6

Reactant 4

HCID 795ImidazoleHCID 962WaterHCID 28928tert-Butyldimethylsilyl chlorideHCID 231033831-Benzothien-2-yl(5-bromo-2-chlorophenyl)methanol

Product 1

HCID 58843508[1-Benzothien-2-yl(5-bromo-2-chloro phenyl)methoxy](tert-butyl) dimethylsilane

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
70 °C

Procedure

Benzo[b]thiophene (1.12 g) was dissolved in tetrahydrofuran (50 ml). This solution was cooled to −78° C., and a solution of 1.58 M hexane (10.5 ml) of n-butyllithium was added dropwise to the solution, and the mixture was stirred for 15 minutes at −78° C. Then, 5-chloro-2-bromobenzaldehyde (3.15 g) dissolved in tetrahydrofuran (50 ml) was added dropwise to the reaction mixture, and the mixture was stirred for two hours at room temperature. Aqueous solution of saturated ammonium chloride was added to the reaction mixture, and then the solvent was evaporated from the filtrate under reduced pressure to give the residue. Ethyl acetate and water were added to the residue obtained, and extracted with ethyl acetate. The organic layer was dried over magnesium sulfate, the solvent was evaporated from the filtrate under reduced pressure to give the residue, and the residue was purified by silica gel column chromatography (n-hexane-ethyl acetate) to obtain 1-benzothien-2-yl(5-bromo-2-chlorophenyl)methanol (4.75 g). Imidazole (1.08 g) and tert-butyl dimethylchlorosilane (2.99 g) were added to a solution of 1-benzothien-2-yl(5-bromo-2-chlorophenyl)methanol in dimethylformamide (100 ml), and the mixture was stirred for three hours at 70° C. Water was added to the reaction mixture, and extracted with diethyl ether. The organic layer was dried over magnesium sulfate, the solvent was evaporated therefrom under reduced pressure to give the residue, and the resulting residue was purified by silica gel column chromatography (n-hexane-ethyl acetate) to obtain [1-benzothien-2-yl(5-bromo-2-chloro phenyl)methoxy](tert-butyl) dimethylsilane (3.34 g).

Workup

  1. extractionextracted with diethyl ether
  2. dry with materialThe organic layer was dried over magnesium sulfate
  3. customthe solvent was evaporated
  4. customunder reduced pressure to give the residue
  5. customthe resulting residue was purified by silica gel column chromatography (n-hexane-ethyl acetate)

Sources & evidence

ORD record
ord-965e11e4f47441368c563737ddfebf67
Source dataset
uspto-grants-2010_08
Patent number
US07772407B2

Reaction notes

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