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Keywords:

  • hydroxycarboxylic acids (ether carboxylic acids) and esters (benzene compounds);
  • halogenated carboxylic acids and esters (benzene compounds);
  • diastereoselective syntheses, enantioselective syntheses (incl. cis/trans-isomerism)

Abstract

Optimized conditions are elaborated and boron reagent NBC is found to be the most efficient one to give diastereomerically pure products (III) from ester (I).