Access to isocarbacyclin derivatives via substrate-controlled enolate formation: total synthesis of 15-deoxy-16-(m-tolyl)- 17,18,19,20-tetranorisocarbacyclin

Org Lett. 2005 Nov 10;7(23):5115-8. doi: 10.1021/ol0515762.

Abstract

[reaction: see text] We describe a convergent and flexible synthesis of 15-deoxy-16-(m-tolyl)-17,18,19,20-tetranorisocarbacyclin (15-deoxy-TIC), a simple isocarbacyclin derivative. The synthesis takes advantage of two key step reactions: a regioselective deprotonation of the described ketone under substrate control which is then trapped, as the enol triflate, to generate the C6-C9alpha endocyclic double bond, followed by an sp2-sp3 Pd-catalyzed cross-coupling reaction (C5-C6) with a suitable primary alkyl Grignard reagent. Introduction of the C13-C14 (E)-double bond in the omega-side chain is performed by the Julia-Kocieñski olefination.

MeSH terms

  • Catalysis
  • Epoprostenol / analogs & derivatives*
  • Epoprostenol / chemical synthesis
  • Epoprostenol / chemistry
  • Molecular Structure
  • Palladium / chemistry*
  • Stereoisomerism

Substances

  • 15-deoxy-16-m-tolyl-17,18,19,20-tetranorisocarbacyclin
  • Palladium
  • Epoprostenol