Nakamura I, Sato T, Terada M, Yamamoto Y. Gold-Catalyzed Cyclization of (ortho-Alkynylphenylthio)silanes: Intramolecular Capture of the Vinyl−Au Intermediate by the Silicon Electrophile.
Org Lett 2007;
9:4081-3. [PMID:
17784768 DOI:
10.1021/ol701951n]
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Abstract
The gold-catalyzed cyclization of (ortho-alkynylphenylthio)silanes 1 produced the corresponding 3-silylbenzo[b]thiophenes 2 in good to excellent yields. For example, the reaction of [2-(1-pentynyl)phenylthio]triisopropylsilane 1a, [2-(p-anisylethynyl)phenylthio]triisopropylsilane 1e, and [2-(phenylethynyl)phenylthio]triisopropylsilane 1g in the presence of 2 mol % of AuCl in toluene at 45 degrees C gave 2a, 2e, and 2g in 98, 99, and 97% yields, respectively. This reaction proceeds through intramolecular capture of the vinyl-Au intermediate by the silicon electrophile, so-called silyldemetalation.
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