Reactions of Isocyanides and Pyridinium Triflates − A Simple and Efficient Route to Imidazopyridinium Derivatives

Imidazo[1,5-a]pyridinium derivatives are easily synthesized by reaction of pyridinium triflates in pure isocyanide. The compounds obtained by treatment of pyridinium, 1,10-phenanthrolinium and 2,2′-bipyridinium triflates with tert-butyl isocyanide are described, along with the crystal structures of the latter two.