SOLVENT-FREE ONE-POT SYNTHESIS OF SPIRO[INDOLINE-3,4 '(1H ')-PYRANO-[2,3-c]PYRAZOL]-2-ONE DERIVATIVES BY GRINDING

The solvent-free one pot synthesis of spiropyranyl-oxindole in the presence of NaHCO(3) under grinding has been achieved. This process is simple, fast, efficient and environmentally benign.