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The syntheses of the above biologically active esters are described. By NMR spectroscopy it is shown that the corresponding ethyl compound 4 may exist in both the trans and the cis conformers. Starting with 4, addition of an appropriate alcohol results in the corresponding 4-alkoxy compound of 4. The described esters are antagonists of aspartic acid as well as of oxalacetic acid and inhibited the growth of E. coli MRE 600.

zeitschrift für naturforschung b

Über Aminosäure-Antagonisten, III Synthese von 4-Alkoxy-2-oxo-trans-3-butensäurealkylestern / On Amino Acid Antagonists, III Syntheses of 4-Alkoxy-2-oxo-trans-3-butenoic Acid Esters