Total synthesis and absolute stereochemical assignment of (-)-communesin F

J Am Chem Soc. 2010 Sep 29;132(38):13226-8. doi: 10.1021/ja106739g.

Abstract

A concise asymmetric total synthesis of (-)-communesin F (∼6% overall yield in the longest linear sequence of 19 steps) is described. It features an unprecedented intramolecular oxidative coupling strategy for the elaboration of the requisite spiro-fused indoline moiety. Other notable elements are the use of TBS-protected (S)-phenylglycinol as a chiral auxiliary to induce the asymmetric formation of the spiro-fused indoline part, the mesylate-mediated formation of its G ring, and the introduction of the A ring at the final stage via intramolecular Staudinger reaction. This intramolecular Staudinger reaction proceeded smoothly at 80 °C, providing an additional example illustrating that twisted amides are more reactive than simple amides. Along with the total synthesis, we were able to assign the absolute configuration of natural communesin F as 6R,7R,8R,9S,11R.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Heterocyclic Compounds, 4 or More Rings / chemical synthesis
  • Heterocyclic Compounds, 4 or More Rings / chemistry*
  • Molecular Structure
  • Stereoisomerism

Substances

  • Heterocyclic Compounds, 4 or More Rings
  • communesin F