Microwave‐assisted nucleophilic cleavage of 5,7‐dimethyl‐2‐phenyl‐1‐oxo‐l H ‐pyrazolo[ 1,2‐ a ]pyrazol‐4‐ylium‐3‐olate to α‐phenylmalonamides

Three α‐phenylmalonamides have been prepared by the selective nucleophilic cleavage of 5,7‐dimethyl‐2‐phenyl‐1‐oxo‐1 H ‐pyrazolo[1,2‐ a ]pyrazol‐4‐ylium‐3‐olate in solventless microwave syntheses. The three weak nucleophiles employed were aniline, p ‐chloroaniline and m ‐toluidine. The α‐phenylmalonamides of these three aniline derivatives could not be prepared using the previously reported solvent syntheses via 3‐oxopyrazolo[1,2‐ a ]pyrazol‐8‐ylium‐1‐olates. All products were characterised using, infrared spectroscopy, 1 H nmr and electrospray mass spectrometry. The single crystal X‐ray structures of the starting pyrazolo‐[1,2‐ a ]pyrazole and α‐phenylmalon‐ m ‐toluidide are also reported.