The title synthesis was examined by employing two synthetic schemes which feature N,O-spiroketal formation as a key step. Although the stepwise synthesis starting with D-fructose and proceeding through the D-psicose derivatives successfully produced a mixture of (+)-hydantocidin (1) and its C5-epimer [(−)-5-epihydantocidin (2)] the one-step synthesis utilizing D-isoascorbic acid and urea as starting