Br枚nsted Acid-Mediated Intramolecular Cyclization of Biaryl Triazenes for the Synthesis of Fluorenes and 9,10-Dihydro-Phenanthrenes

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• 作者：Lijun Xu ; Weijun Yang ; Lili Zhang ; Maozhong Miao ; Zhigen Yang ; Xin Xu ; Hongjun Ren
• 刊名：Journal of Organic Chemistry
• 出版年：2014
• 出版时间：October 3, 2014
• 年：2014
• 卷：79
• 期：19
• 页码：9206-9221
• 全文大小：681K
• ISSN：1520-6904

文摘

The efficient synthesis of fluorenes from biaryl triazenes is successfully developed. Up to 27 examples of biaryl triazenes are converted into their corresponding fluorene derivatives in the presence of CF₃COOH (4.0 equiv). Mechanism research indicates that the reaction undergoes concerted processes, and pentacoordinate carbocations may be involved in these reactions.