Imidazole → (2-Bromoethoxy)(tert-butyl)diphenylsilane

HRID 1873369Notes

Reaction equation

[Br:1][CH2:2][CH2:3][OH:4].N1C=CN=C1.[C:10]([Si:14]([C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)Cl)([CH3:13])([CH3:12])[CH3:11].[Cl-].[Na+]>CN(C)C=O>[Br:1][CH2:2][CH2:3][O:4][Si:14]([C:10]([CH3:13])([CH3:12])[CH3:11])([C:22]1[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=1)[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1

Participants

Conditions

Temperature: 0 °C

Procedure

Separately, 2.50 g (corresponding to 20.0 mmol) of 2-bromoethanol and 2.72 g (corresponding to 40.0 mmol) of imidazole were dissolved in 10 mL of dimethylformamide (DMF), and cooled to 0° C. Then, 5.50 g (corresponding to 20.0 mmol) of t-butyldiphenylchlorosilane (TBDPSCl) was added thereto. After the reaction mixture was stirred at room temperature for 18 hours, a saturated sodium chloride solution was added, and extracted three times with ethyl acetate. The combined ethyl acetate layers were dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting crude product was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1) to obtain 7.04 g (corresponding to 19.4 mmol) of 1-bromo-2-(t-butyldiphenylsiloxy)ethane (FIG. 2-1, Step 3).

Workup

extractionextracted three times with ethyl acetate
dry with materialThe combined ethyl acetate layers were dried over anhydrous sodium sulfate
concentrationconcentrated under reduced pressure
customThe resulting crude product was purified by silica gel column chromatography (elution solvent: hexane/ethyl acetate=10/1)

Sources & evidence

ORD record: ord-1e76556f15c248bdb3c86fc64da768ef
Source dataset: uspto-grants-2012_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08303935B2

Reaction notes

Loading…