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Keywords:

  • fenclozic acid;
  • acyl glucuronide;
  • cyanide

An updated approach to the 1960s synthesis of [14C] fenclozic acid from labelled potassium cyanide is presented. By employing modern synthetic methodology and purification techniques, many of the inherent hazards in the original synthesis are avoided or significantly reduced. The concomitant labelled stereoselective synthesis of the key acyl glucuronide metabolite (the 1-β-O-acyl glucuronide) is also described.