We report a novel gold(l)-catalyzed benzannulation of 3-hydroxy-1,5-enynes to prepare tetrahydronaphthalenes. The reaction is catalyzed by 2.5 mol % Ph3PAuCl and 2.5 mol % AgOTf in dichloromethane. We discovered that this process can be also catalyzed by I mol % Ph3PAuCl and I mol % TfOH. To the best of our knowledge, this constitutes the first report of an active gold catalyst generated from Au(PPh3)Cl and triflic acid. This mild process is compatible with a variety of functional groups and proves to be an effective method to synthesize various metasubstituted aromatic rings in good yields. (c) 2007 Elsevier Ltd. All rights reserved.
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E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R ChinaE China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
Gao, Hongyin
Wu, Xingxing
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E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R ChinaE China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
Wu, Xingxing
Zhang, Junliang
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E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
Chinese Acad Sci, Shanghai Inst Organ Chem, State Key Lab Organometall Chem, Beijing 100864, Peoples R ChinaE China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China