Induction of a preferred sense of twist in flexible diphenyls by carbohydrate scaffolds. Synthesis of two "naked" ellagitannin analogous

J Org Chem. 2001 Dec 28;66(26):8787-92. doi: 10.1021/jo010522c.

Abstract

The synthesis of "naked" ellagitannin analogues 1 and 2, having a preferred sense of twist of the diphenyl moiety, with a rhamnose and a glucose template, is reported. A clear induction in the chirality of the diphenyl moiety, mediated through a 10-membered ring via ester linkages, was observed. The chiral scaffold of glucose (diequatorial 2,3-hydroxyl groups) exerts a remarkable stronger atropdiastereoselective effect onto the diphenoyl group than the rhamnose ring (axial-equatorial 2,3-hydroxyl groups), according to the Schmidt-Haslam hypothesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biphenyl Compounds / chemistry*
  • Carbohydrates / chemistry*
  • Circular Dichroism
  • Hydrolyzable Tannins*
  • Indicators and Reagents
  • Spectrophotometry, Ultraviolet
  • Stereoisomerism
  • Tannins / chemical synthesis*

Substances

  • Biphenyl Compounds
  • Carbohydrates
  • Hydrolyzable Tannins
  • Indicators and Reagents
  • Tannins
  • ellagitannin