1: C10H8BN3O2 With sodium hydrogencarbonate in ethylene glycol dimethyl ether; water T=45°C; 0.25 h; 2: 3-bromo-pyridine With tetrakis(triphenylphosphine) palladium(0) in ethylene glycol dimethyl ether; water Suzuki cross-coupling reaction; 6 h; Heating; Further stages.;