Enantioselective total synthesis of all of the known chiral cleroindicins (C-F): clarification among optical rotations and assignments

J Org Chem. 2009 Jun 5;74(11):4104-9. doi: 10.1021/jo900401k.

Abstract

Enantioselective syntheses of all of the named chiral members of the cleroindicin family (C-F) are reported. This effort demonstrates the synthetic utility of a 2,4-dihydroxybenzaldehyde as a starting material for natural product synthesis through the use sequential o-quinone methide chemistry and diastereoselective dearomatization. Natural cleroindicin F was shown to be nearly racemic, and an optically pure synthetic sample of cleroindicin F was found to racemize under slightly basic conditions. All other natural chiral cleroindicins are shown to be partially racemic.

Publication types

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

MeSH terms

  • Benzaldehydes / chemistry*
  • Benzofurans / chemical synthesis*
  • Optical Rotation
  • Stereoisomerism

Substances

  • Benzaldehydes
  • Benzofurans
  • cleroindicin C
  • cleroindicin D
  • cleroindicin E
  • cleroindicin F