Cu-exchanged phosphotungestic acid: An efficient and reusable heteropoly acid for the cyclopropanation of alkenes via C-H insertion

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• 作者：J.S. Yadav ; B.V. Subba Reddy ; K.V. Purnima ; K. Nagaiah ; N. Lingaiah
• 关键词：Carbene insertion ; Cyclopropanation ; Cyclopropane carboxylates
• 刊名：Journal of Molecular Catalysis A ; Chemical
• 出版年：2008
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：18 April 2008
• 卷：285
• 期：1-2
• 页码：36-40
• 文件大小：172 K

摘要

Alkenes undergo smooth cyclopropanation with ethyl diazoacetate using a catalytic amount of Cu-exchanged phosphotungestic acid (Cu-TPA) in dichloromethane under mild reaction conditions to afford cyclopropanecarboxylates in high yields with moderate selectivity. The catalyst is recycled and reused for three to four subsequent runs with a minimal decrease of activity.