Heterocycles from amino acids. A novel synthetic approach for imidazo[1,5‐a]pyridines and imidazo[1,5‐a]quinolines

Abstract From the corresponding heterocyclic amino acids 2 and 9a the heterocyclic systems imidazo[1,5‐a]pyridine (3) and imidazo[1,5‐a]quinoline (10) are easily accessible. From compound 7 the tricyclic system 11 was prepared and from compound 17a a pyridyl‐1,2,4‐triazinone (18) could be obtained.