Volume 53, Issue 37 pp. 9880-9883
Communication

Synthesis of Bridged Oxafenestranes from Pleuromutilin

Robert W. Hicklin

Robert W. Hicklin

Department of Chemistry, University of Illinois at Urbana-Champaign, 261 RAL, Box 36-5, 600 S. Mathews, Urbana, IL 61801 (USA)

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Tania L. López Silva

Tania L. López Silva

Department of Chemistry, University of Illinois at Urbana-Champaign, 261 RAL, Box 36-5, 600 S. Mathews, Urbana, IL 61801 (USA)

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Prof. Paul J. Hergenrother

Corresponding Author

Prof. Paul J. Hergenrother

Department of Chemistry, University of Illinois at Urbana-Champaign, 261 RAL, Box 36-5, 600 S. Mathews, Urbana, IL 61801 (USA)

Department of Chemistry, University of Illinois at Urbana-Champaign, 261 RAL, Box 36-5, 600 S. Mathews, Urbana, IL 61801 (USA)Search for more papers by this author
First published: 17 July 2014
Citations: 35

We are grateful to the University of Illinois at Urbana-Champaign for support of this work. We would like to thank Dr. Danielle Gray and Dr. Jeffrey Bertke for X-ray analysis.

Graphical Abstract

Fenestranes are highly strained molecules possessing a quaternary carbon atom with bonds that deviate from the canonical tetrahedral geometry. The natural product pleuromutilin can be used as a starting material for the synthesis of bridged [4.5.5.5]- and [4.5.7.5]oxafenestranes through a carbocation rearrangement cascade. X-ray crystallography shows that these compounds exhibit significant planarization of the central tetracoordinate carbon center.

Abstract

Fenestranes are an intriguing class of highly strained molecules possessing a quaternary carbon with bonds that deviate from the canonical tetrahedral geometry. Herein we report the discovery that the natural product pleuromutilin can be used as a structurally complex starting material for the synthesis of a series of bridged cis,cis,cis,cis-[4.5.5.5]- and cis,cis,cis,cis-[4.5.7.5]oxafenestranes through a carbocation rearrangement cascade. X-ray crystallographic analysis of several cis,cis,cis,cis-[4.5.5.5]oxafenestranes shows a significant planarization of the central tetracoordinate carbon atom and demonstrates the influence of bridgehead substituents and bridging rings on planarity.

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