An efficient and convenient protocol for the synthesis of quinoxalines and dihydropyrazines via cyclization-oxidation processes using HClO4·SiO2 as a heterogeneous recyclable catalyst
Keywords: α-Bromoketone; 1,2-Diamine; HClO4·SiO2; Cyclization-oxidation processes; Quinoxaline; Dihydropyrazine; Heterogeneous recyclable catalyst;