Add time:08/09/2019 Source:sciencedirect.com
Horner–Wadsworth–Emmons olefination of ring-fluorinated N-trityl-imidazole carboxaldehydes with dialkyphosphonoacetic acid esters produced ring-fluorinated imidazolyl-E- and Z-acrylate esters. Stereochemistry was controlled by choice of phoshonate. Acid catalyzed removal of trityl followed by ester saponification gave the target 2- and 4-fluoro-E- and Z-urocanic acid derivatives. These are being investigated as potential mediators of photo-immunosupression.
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