Mono- and bis-addition reactions of the β,γ-unsaturated Grignardreagents and to the C bonds of quinoxalines afford high yields of dihydroquinoxalines and tetrahydroquinoxalines . Dehydrogenation of and with DDQ leads to allylic quinoxalines and respectively in very good yields. Allylic and propargylic quinoxalines and can conveniently be synthesized by “cross-coupling” of 2-chloro-3-methylquinoxaline