1,2,3,4-Tetrahydropyrido[3,4-b]pyrazine is used in a study of aminopyridines and their pharmacokinetics, side effects, and antidote effect on botulinum neurotoxin intoxication. It is also used in a continuous flow strategy for preparation and elaboration of semi-saturated heterobicyclic fragments for fragment-?based drug discovery (FBDD) programs.