Synthesis of Spiroindolines on the Basis of Isatylidene Malononitrile

New representatives of spiroindolines are synthesized by the reaction of isatylidene malononitrile with methylene-active compounds (malononitrile, acetoacetanilide, ethyl 4-chloroacetoacetate) in the presence of ethylenediamine and piperazine hydrate.