Biginelli reactions are simple one-pot, but low yielding, condensations of -dicarbonyl compounds with aldehyde, and urea or thiourea in the presence of catalytic amount of acid to produce DHPMs . Performing efficient chemical transformations coupling three or more components in a single operation by a catalytic process while avoiding stoichiometric toxic reagents, large amounts of solvents, and expensive purification techniques is a very important goal of the modern organic synthesis [3c]. Thus,Biginelli’s reaction for the synthesis of DHPMs has received renewed interest, and several improved procedures have recently been reported [15,18–32]. However in spite of their potential
utility, many of the reported one-pot protocols involve prolonged reaction times, unsatisfactory yields, cumbersome product isolation procedures, expensive reagents, stoichiometric amounts of catalysts, strongly acidic conditions, incompatibility with other functional groups and environmental pollution [24–26,33–35].Thus in spite of a large number of methods reported for this transformation, there has been considerable interest to explore simple, milder, rapid and high-yielding protocols by employing environmentally friendly and reusable catalysts.