A simple and efficient microwave-induced ruthenium trichloride-catalyzed synthesis of pyrrole fused with indole system in water is developed by reacting commercially available isatin and 4-hydroxyproline.
Bandyopadhyay, D., Banik, A., Bhatta, S., & Banik, B. K. (2009). Microwave-Assisted Ruthenium Trichloride-Catalyzed Synthesis Of Pyrrole Fused With Indole System In Water. Heterocyclic Communications, 15(2), 121–122. https://doi.org/10.1515/HC.2009.15.2.121