Majid M.Heravi - Department of Chemistry, School of Sciences, Alzahra University, Tehran, Iran
Atefeh Bakhtiari - Department of Chemistry, School of Sciences, Alzahra University, Tehran, Iran

we used nano-SiO2-supported Preyssler heteropolyacid (HPA) as a green and reusable catalyst to improve direct alkylation of indole with 1,3- dicarbonyl under mild reaction condition. This catalyst can be easily seperated along with the good yields of the products