Reactant for enantioselective α-amination reactions;Reactant for aldol reaction with glyoxal derivatives;Reactant for amine thiourea catalyzed conjμgate addition to α,β-unsaturated aldehydes;Reactant for O-acetylation reactions;Reactant for preparation of a disubstituted oxoindole by using rhodium-catalyzed cyclopropanation/ring-opening reactions. Reactant for enantioselective α-amination reactions;Reactant for aldol reaction with glyoxal derivatives;Reactant for amine thiourea catalyzed conjugate addition to α,β-unsaturated aldehydes;Reactant for O-acetylation reactions;Reactant for preparation of a disubstituted oxoindole by using rhodium-catalyzed cyclopropanation/ring-opening reactions.