Stereoselective synthesis of the butyrolactone and the oxazoline/furan fragment of leupyrrin A(1)

Org Lett. 2013 Jun 7;15(11):2774-7. doi: 10.1021/ol401110x. Epub 2013 May 17.

Abstract

Stereoselective syntheses of the Northern and the Southern fragments 2 and 3 of leupyrrin A1 are reported. The convergent preparation of 2 is highlighted by a zirconocene-mediated one-pot cyclization-regioselective opening of an advanced diyne while the route to 3 involves a Krische allylation and a one-pot Sharpless dihydroxylation-cyclization. Comparison of the spectroscopic data with those reported for the natural product supports a relative stereochemical assignment within these heterocycles.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 4-Butyrolactone / analogs & derivatives*
  • 4-Butyrolactone / chemical synthesis*
  • 4-Butyrolactone / chemistry
  • Cyclization
  • Furans / chemical synthesis*
  • Furans / chemistry
  • Oxazoles / chemistry*
  • Stereoisomerism

Substances

  • Furans
  • Oxazoles
  • leupyrrin A1
  • 4-Butyrolactone
  • furan