An efficient approach to the synthesis of some novel heterocycles related to indoline moiety using [BMIm]Cl catalysis

The combination of isatins, active methylene reagents and 4- phenylurazole/ phthalhydrazide in the presence of ionic liquid ([BMIm]Cl) as a solvent catalyst was found to be a suitable and efficient method for the synthesis of the biologically important spirooxindoles. The features of this procedure were characterized by one-pot procedure, reasonable reaction times, fairly high yields, and simple isolation procedures. The ionic liquid can be easily separated and reused for several times.