Solvent- and halide-free synthesis of pyridine-2-yl substituted ureas through facile C-H functionalization of pyridine N-oxides - Rassadin, Valentin A; Zimin, Dmitry P; Raskil'dina, Gulnara Z; Ivanov, Alexander Yu; Boyarskiy, Vadim P; Zlotskii, Semen S; Kukushkin, Vadim Yu (GREEN CHEMISTRY, 2016)