Total synthesis of natural (+)- [corrected] and ent-(-)-4-desacetoxy-6,7-dihydrovindorosine [corrected] and natural and ent-minovine: oxadiazole tandem intramolecular Diels-Alder/1,3-dipolar cycloaddition reaction

Org Lett. 2005 Feb 17;7(4):741-4. doi: 10.1021/ol050017s.

Abstract

Efficient and unusually concise total syntheses of both enantiomers of the Aspidosperma alkaloids 4-desacetoxy-6,7-dihydrovindorosine (12) and minovine (1) are detailed. A tandem intramolecular Diels-Alder/1,3-dipolar cycloaddition reaction of the 1,3,4-oxadiazole 8, in which three new rings, four new C-C bonds, and five stereocenters are formed, is a key step in the sequence. The availability of optically active material permitted an assessment of the enantiomeric integrity of minovine and the source of its reported unusual optical rotation. [Reaction: see text]

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Alkaloids / chemical synthesis*
  • Alkaloids / chemistry
  • Magnetic Resonance Spectroscopy
  • Models, Molecular
  • Molecular Structure
  • Oxadiazoles
  • Vinca Alkaloids / chemical synthesis*
  • Vinca Alkaloids / chemistry

Substances

  • Alkaloids
  • Oxadiazoles
  • Vinca Alkaloids
  • ent-4-desacetoxy-6,7-dihydrovindorosine
  • minovine