Ja. Zoltewicz et Mp. Cruskie, N-METHYLATION AND N-OXIDATION OF THE LESS REACTIVE NITROGEN ATOM OF A2,3'-BIPYRIDINE - 2 GENERAL-METHODS FOR POLYAZINES, Tetrahedron, 51(11), 1995, pp. 3103-3114
5-Carbamoyl-2,3'-bipyridine model compound was N-methylated or N-oxidi
zed at the less reactive 2-pyridyl ring for the first time. Two differ
ent schemes were developed.