Catalyst and solvent-free cyclopropanation of electron-deficient olefins with cyclic diazoamides for the synthesis of spiro[cyclopropane-1,3′-indolin]-2′-one derivatives

A novel series of spirooxindolylcyclopropane derivatives have been synthesized in high yields from 3-diazooxindole and electron deficient olefins under catalyst/solvent-free conditions.