Reactant for preparation of tryptophan dioxygenase inhibitors as potential anticancer immunomodulators Reactant for stereoselective preparation of γ-lactones via prolinol silyl ether catalyzed Friedel-Crafts alkylation reaction Reactant for iridium-catalyzed borylation reactions Reactant for parallel synthesis of N-benzylisatin oximes as JNK3 MAP kinase inhibitors Reactant for preparation of N-aryl indoles Reactant for preparation of conformationally restricted indole cyclopropylmethylamines as selective serotonin reuptake inhibitors