Total Synthesis of Dehaloperophoramidine: Evolution of a Synthesis

Research output: Chapter in Book/Report/Conference proceedingBook chapter

Abstract

This account describes our efforts toward developing a stereodivergent entry to perophoramidine and the communesin alkaloids. The original approach toward our simplified model substrates relied on a palladium-catalyzed carbopalladation–carbonylation of a tetrasubstituted olefin to install the vicinal all-carbon quaternary stereocenters present in the target molecules, the olefin's stereochemistry thus dictating the relative stereochemistry of the quaternary stereocenters. Although the carbonylation–carbopalladation sequence worked well for trisubstituted olefins, only premature esterification was observed when using tetrasubstituted alkene substrates. Our second approach made use of the latent symmetry embedded in our target molecules. A Diels–Alder reaction or SmI2-mediated bis-alkylation of isoindigo was to be used to access the communesin and perophoramidine scaffolds, respectively. We found that due to unfavorable thermodynamics, it was not possible to reach the communesin scaffold. However, two new complexity-generating, cascade reactions were encountered en route to the synthesis of dehaloperophoramidine, resulting in a short and efficient synthesis.

Details

Authors
  • Jakob Danielsson
  • Kirill Popov
  • Brinton Seashore-Ludlow
  • Peter Somfai
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Organic Chemistry
  • Analytical Chemistry

Keywords

  • Cascade reactions, Diels–Alder reactions, Domino reactions, Indole alkaloids, Palladium, Total synthesis
Original languageEnglish
Title of host publicationStrategies and Tactics in Organic Synthesis
PublisherAcademic Press
Pages217-242
Number of pages26
Volume13
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes

Publication series

NameStrategies and Tactics in Organic Synthesis
Volume13
ISSN (Print)1874-6004