Abstract
The reaction of isatin and indoles in refluxing water/ethanol (7:3) affords 3,3′-di(indolyl)oxindoles in excellent yields.
ACKNOWLEDGMENTS
We thank the Department of Science and Technology, New Delhi, for financial support. M. L. D. thanks the Council of Scientific and Industrial Research (India) for the award of a senior research fellowship.
Notes
a Isolated yields.