Synthesis of Spirooxindole Oxetanes Through a Domino Reaction of 3‐Hydroxyoxindoles and Phenyl Vinyl Selenone

An unprecedented Michael/intramolecular etherification cascade reaction of phenyl vinyl selenone with 3‐hydroxyoxindoles under aqueous basic conditions at room temperature is described. The method provides a domino access to new spirooxindole 2,2‐disubstituted oxetanes in moderate to good yields under mild reaction conditions.