Nano-SiO2@[DABCO(CH2CH2CO2H)]+[Br]− as an efficient and recyclable SCILL for water mediated facile synthesis of thiol-substituted N-aryl pentasubstituted pyrroles

Abstract Nano sized silica supported DABCO based amphoteric ionic liquid coated combined catalytic system Nano-SiO2@[DABCO(CH2CH2CO2H)]+[Br]− has been synthesised in a very simple and convenient way. This newly synthesised SCILL has been characterised via FT-IR, SEM, HRTEM and EDAX spectra. The high efficiency of this catalyst was unquestionably recognised when 31 new thiol induced penta-substituted pyrroles were synthesised in water via two different schemes in high yields. This recyclable, quasi heterogeneous catalyst shows synergetic catalytic effect of acidic nano sized silica particles and amphoteric DABCO based ionic liquid.