Bmim(OH)/chitosan/C2H5OH synergy: grinding induced, a new route for the synthesis of spiro-oxindole and its derivatives

Abstract

Here we report a synthetic strategy based on the synergistic effect of a catalyst system incorporating Bmim(OH), chitosan and C₂H₅OH. This powerful catalyst system is very effective and has several advantages such as being cost effective, involving shorter reaction times, being high yielding, involving the formation of no by-products and most importantly its easy recyclability (at least three times) with negligible reduction in its catalytic properties.