A New Class of Pyrazolopyridine Nucleus with Fluorescent Properties, Obtained through Either a Radical or a Pd Arylation Pathway from N-Azinylpyridinium N-Aminides
The synthesis of dipyridopyrazole and pyridopyrazolopyrazine derivatives—both of which incorporate a 3-aryl moiety—can be achieved in moderate yields by intramolecular radical arylation of pyridinium N-aminides using tris(trimethylsilyl)silane and azobisisobutyronitrile. Improved results were obtained on using Pd direct arylation in conjunction with microwave irradiation. A preliminary study into the fluorescent properties of the target compounds is also reported.
Experimental procedures and copies of 1H and 13C spectra for selected compounds. This material is available free of charge via the Internet at http://pubs.acs.org.
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