Transition-metal-free C–N and C–C formation: synthesis of benzo[4,5]imidazo[1,2-a]pyridines and 2-pyridones from ynones

We have developed a facile method for the synthesis of benzo[4,5]imidazo[1,2-a]pyridines and 2-pyridones from readily available ynones and 2-methylbenzimidazoles or acetamides.