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

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Reaktionsgleichung

[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

Komponenten

Reaktionsbedingungen

Temperatur: 0 °C

Versuchsvorschrift

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 aqueous 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. 1, Step 3).

Aufarbeitung

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)

Quellen und Nachweise

ORD-Eintrag: ord-aa93aa979e69492f86cde83da250a7da
Quelldatensatz: uspto-grants-2012_06
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08207189B2

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