Total synthesis of (+)-crocacin C using hidden symmetry

J Org Chem. 2010 Mar 5;75(5):1354-9. doi: 10.1021/jo902582w.

Abstract

A highly convergent and protecting-group-free synthesis of (+)-crocacin C, featuring an enzymatic enantioselective desymmetrization of a meso-diol, a base-induced ring opening of a THP ring, and a one-pot hydrostannylation/Stille coupling as the key steps, is reported. The natural product was obtained in 11 steps and 22.3% overall yield starting from readily available oxabicycle 1. Finally, a unique enantioselective step, an enzymatic desymmetrization, revealed four stereogenic centers and created one in C4 of the THP furnishing the dense building block 4 with high enantioselectivity (ee >98%).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alkenes / chemical synthesis*
  • Alkenes / chemistry
  • Amides / chemical synthesis*
  • Amides / chemistry
  • Catalysis
  • Cyclization
  • Models, Molecular
  • Molecular Structure
  • Stereoisomerism
  • Structure-Activity Relationship

Substances

  • Alkenes
  • Amides
  • crocacin C