The naturally occurring spironucleoside (+)-hydantocidin 1 was synthesized from 1,2:3,4-di-O-isopropylidene-D-psicofuranose using a new oxygen-bridged intramolecular Vorbruggen coupling of the N-hydroxyurea 5 in presence of a catalytic amount of trimethylsilyltriflate.
The naturally occurring spironucleoside (+)-hydantocidin 1 was synthesized from 1,2:3,4-di-O-isopropylidene-D-psicofuranose using a new oxygen-bridged intramolecular Vorbruggen coupling of the N-hydroxyurea 5 in presence of a catalytic amount of trimethylsilyltriflate.