“…8 In recent years, the alkyne-carbonyl metathesis (ACM) reaction, promoted by either Lewis acid 9 or Brønsted acid, 10 has been used as an alternative to more classical olefination reactions in the synthesis of carbocycles, heterocycles, and polycyclic aromatic frameworks. 11,12 For example, Jana et al reported the synthesis of seven-membered rings, such as dihydrobenzo[ b ]azepines, dibenzo[ b , f ]oxepines and benzo[ b ]oxepines, by iron( iii ) chloride-catalyzed intramolecular alkyne–carbonyl metathesis. 11 b , c Herein, we wish to report a new approach to imidazo[1,2- a ]azepines via Brønsted acid mediated ACM reactions (Scheme 2).…”