1: rac-2-methylpiperazine With [2,2']bipyridinyl; nickel diacetate; sodium hydride; 1,1-dimethylpropan-1-ol in tetrahydrofuran T=65°C; 2 h; 2: alpha-chloropyridine With styrene in tetrahydrofuran T=65°C; 8.5 h;