Potential bile acid metabolites. 24. An efficient synthesis of carboxyl-linked glucosides and their chemical properties

Lipids. 2002 Jan;37(1):101-10. doi: 10.1007/s11745-002-0869-3.

Abstract

A facile and efficient synthesis of the carboxyl-linked glucosides of bile acids is described. Direct esterification of unprotected bile acids with 2,3,4,6-tetra-O-benzyl-D-glucopyranose in pyridine in the presence of 2-chloro-1,3,5-trinitrobenzene as a coupling agent afforded a mixture of the alpha- and beta-anomers (ca. 1:3) of the 1-O-acyl-D-glucoside benzyl ethers of bile acids, which was separated effectively on a C18 reversed-phase chromatography column (isolated yields of alpha- and beta-anomers are 4-9% and 12-19%, respectively). Subsequent hydrogenolysis of the alpha- and beta-acyl glucoside benzyl ethers on a 10% Pd-C catalyst in acetic acid/methanol/EtOAc (1:2:2, by vol) at 35 degrees C under atmospheric pressure gave the corresponding free esters in good yields (79-89%). Chemical specificities such as facile hydrolysis and transesterification of the acyl glucosides in various solvents were also discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bile Acids and Salts / chemical synthesis*
  • Bile Acids and Salts / chemistry
  • Bile Acids and Salts / metabolism*
  • Glucosides / chemical synthesis*
  • Glucosides / chemistry
  • Glucosides / metabolism*
  • Glycoconjugates / chemical synthesis
  • Glycoconjugates / chemistry
  • Glycoconjugates / metabolism
  • Humans
  • Magnetic Resonance Spectroscopy
  • Mass Spectrometry
  • Molecular Structure

Substances

  • Bile Acids and Salts
  • Glucosides
  • Glycoconjugates