Total Synthesis of (±)-Aspidospermidine, (±)-Aspidofractinine, (±)-Limaspermidine, and (±)-Vincadifformine via a Cascade and Common Intermediate Strategy

J Org Chem. 2022 Nov 18;87(22):15559-15563. doi: 10.1021/acs.joc.2c02099. Epub 2022 Oct 19.

Abstract

A concise strategy for the total synthesis of several Aspidosperma alkaloids is reported. A Suzuki-Miyaura cross-coupling provides access to a 2-vinyl indole that undergoes a Diels-Alder cascade reaction with butyn-2-one to deliver a pyrroloindoline intermediate. This undergoes cascade amidation, reduction, skeletal rearrangement, and intramolecular Michael addition to provide a common intermediate containing the full framework of the Aspidosperma alkaloids. The utility of this intermediate is shown in the synthesis of four different natural products.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkaloids*
  • Aspidosperma*
  • Indole Alkaloids
  • Stereoisomerism

Substances

  • limaspermidine
  • aspidospermidine
  • aspidofractinine
  • vincadifformine
  • Indole Alkaloids
  • Alkaloids