CuO NPs/rGO composite was synthesized and characterized by various analytical techniques an used as a recyclable catalyst for Petasis-borono–Mannich reaction under microwave irradiation.
The significance of hydrophobicity for the synthesis of spiro[acenaphthylene-1,5′-pyrrolo[1,2-c]thiazole] derivatives by a 1,3-dipolar cycloaddition reaction in aqueous medium is outlined.
An “all water” strategy for the catalyst free chemo‐selective synthesis of pyranopyrazoles via the reaction of 3‐methyl‐1‐phenyl‐1H‐pyrazol‐5(4H)‐one with benzyl alcohols has been developed. Water actuates the reaction via ‘electrophile– nucleophile dual activation’ of the reactants through the concerted hydrogen bonding network and impel the reactants for C−C bond formation. Reaction proceeds by metal and catalyst free oxidation–Michael addition–cyclization–dehydration sequence. This method gave pyrano[2, 3‐c:6,5‐c′]dipyrazol]‐2‐ones selectivity over other possible products. Furthermore, this method is also applied on the reaction of the benzyl alcohols and dimedone to give arylmethylene[bis(5,5‐dimethyl‐3‐hydroxy‐2‐cyclohexene‐1‐ones)] in good to excellent yields.
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