Formal total syntheses of the (-)-salicylihalamides A and B from D-glucose and L-rhamnose

J Org Chem. 2005 Sep 16;70(19):7592-604. doi: 10.1021/jo050750x.

Abstract

[reaction: see text] Two formal total syntheses of the (-)-salicylihalamides, based on chiral pool approaches, are reported. D-glucose and L-rhamnose were used to prepare advanced intermediates 23 and 54, which can be converted in three or four steps, respectively, to the target compounds. The synthesis of 23 from a known D-glucose-derivative was accomplished in 12 steps and 17% overall yield, and the synthesis of 54 from a known L-rhamnose-derivative was done in nine steps and 6% overall yield. A key step in the synthesis was a ring-closing metathesis reaction to prepare the macrocyclic ring system. It was demonstrated that the phenolic protecting group was critical for inducing the preferential formation of the desired E isomer. It was further shown that the protecting group at the C13 hydroxyl group had no significant influence on the E:Z ratio during the ring-closing metathesis reaction.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bridged Bicyclo Compounds, Heterocyclic / chemical synthesis*
  • Glucose
  • Rhamnose
  • Stereoisomerism

Substances

  • Bridged Bicyclo Compounds, Heterocyclic
  • salicylihalamide A
  • Glucose
  • Rhamnose