Application Building block for preparation of 3-functionalized indoles Building block for preparation carbazoles Building block for preparation of cyanoindoles Reactant for preparation of trifluoromethylindoles Reactant for preparation of potent antihyperlipidemic agents Building block in iso-Nazarov or Nazarov cyclizations Reactant for preparation of GSK-3ß inhibitors Building block for preparation of carboxyindoles Reactant for preparation of plant growth promoters Reactant for preparation of tryptophan derivatives