4.8 Article

Total Synthesis of Gracilioether F: Development and Application of Lewis Acid Promoted Ketene-Alkene [2+2] Cycloadditions and Late-Stage C-H Oxidation

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 53, Issue 52, Pages 14522-14526

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201408055

Keywords

C-H oxidation; cycloaddition; gracilioether F; ketenes; total synthesis

Funding

  1. Indiana University
  2. U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
  3. National Science Foundation/Department of Energy [NSF/CHE-1346572]
  4. Division Of Chemistry
  5. Direct For Mathematical & Physical Scien [1346572] Funding Source: National Science Foundation

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The first synthesis of gracilioether F, a polyketide natural product with an unusual tricyclic core and five contiguous stereocenters, is described. Key steps of the synthesis include a Lewis acid promoted ketene-alkene [2+2] cycloaddition and a late-stage carboxylic acid directed C(sp(3))-H oxidation. The synthesis requires only eight steps from norbornadiene.

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