Microwave-Induced One - Pot Synthesis of some new Spiro [Indoline-3,2′-Thiazolidine]-2,4′<i>(1H)</i>-Diones and Bis [Spiro [Indoline -3,2′-Thiazolidine]-2,4′<i>(1H)</i>-Diones]
Abstract The title compounds have been obtained thermally and under microwave irradiation by condensation of isatin, aromatic amines and mercaptoacetic acid in good to excellent yields without isolating the imine intermediates.
The solvent-free, microwave (MW)-assisted synthesis of a new series of 3′-(aryl/heteroaryl)-1-morpholinomethyl/piperidinomethylspiro[3H-indole-3,2′-thiazolidine]-2,4′(1H)-diones has been achieved in an open vessel. Isatins undergo an easy condensation with various aryl/heteroaryl amines by MW using montmorillonite K10 clay as a solid support to afford Schiff bases , which subsequently undergo smooth