The reaction of some arylglyoxals with a variety of 2-amino heterocycles, including pyridine, diazine, and azole derivatives, has been studied, with or without BF3. Et20 complex as catalyst. On the basis of the isolation of different intermediate carbinolamines and of some crossover cyclization experiments, a reasonable mechanism has been proposed for all these processes. In addition, some structural features of the resulting bicyclic imidazo [l, 2- ...
![Imidazo[1,2-a]pyrazin-3(7H)-one,2-phenyl- Structure](https://image.chemsrc.com/caspic/443/27955-58-4.png)