Synthetic Studies toward Leucosceptroid Family of Natural Products

J Org Chem. 2021 Aug 20;86(16):11040-11052. doi: 10.1021/acs.joc.0c02597. Epub 2021 Jan 7.

Abstract

Leucosceptroids are sesterterpenoids with potent antifeedant and antifungal activities. In this paper, efforts on two synthetic strategies toward stereoselective total synthesis of the leucosceptroid family of natural products are reported. Intramolecular addition cyclization strategy could lead to a stereochemically mismatched core structure, while intermolecular addition/ring-closing metathesis cyclization strategy successfully furnished an advanced common intermediate bearing eight contiguous stereogenic centers, including three tetra-substituted ones, which fully matches all the stereochemistry on the tricyclic framework in leucosceptroid H. Late-stage transformation of this intermediate to leucosceptroid H encountered difficulty in oxidizing the secondary hydroxyl group to a carbonyl group in the target. Instead of the desired oxidation, an interesting tricyclic spiral product originating from a C-C bond cleavage was observed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antifungal Agents / pharmacology
  • Biological Products*
  • Cyclization
  • Molecular Structure
  • Oxidation-Reduction
  • Stereoisomerism

Substances

  • Antifungal Agents
  • Biological Products