Abstract
(+)- and ()-Nephrosteranic acid (16) have been prepared in an enantioselective fashion from alkyne acid 19 (or ent-19) by a three step sequence involving debenzylationlactonization, oxidative cleavage, and selective epimerization at C4. Acids 19 and ent-19 were obtained as single enantiomers employing a NicholasSchreiber reaction.Key words: paraconic acids, nephrosteranic acid, butyrolactones, NicholasSchreiber reaction.
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