“…Among these, compounds exhibiting a pyrrole ring sharing a C‐N bond with another heterocycles have shown a wide spectrum of biological activities . In this regard, the 1,2,3,4‐tetrahydropyrrolo[1,2‐ a ]pyrazine core is present in a great number of molecules associated with a wide variety of biological activities, such as antihypoxic, antiarrhythmic, aldose reductase inhibitors, potassium channel ligands, serotonin reuptake inhibitors, and cannabinoid receptor agonists . Particularly, the 1,2,3,4‐tetrahydropyrrolo[1,2‐ a ]pyrazine‐1‐carboxylic acid 1 and its 3‐oxo derivative 2 have been used as key intermediates in the synthesis of bradykinin 1 receptor (B1R) inhibitors and potential physiologically active agents, respectively.…”