bis(1,2-diphenylphosphino)benzene; copper (II) acetate monohydrate; lithium tert-butylate in tetrahydrofuran T=20°C; Chan-Lam type coupling; 4 h; Inert atmosphere;

1: acetic acid tert-butyl ester With Zn(2,2,6,6-tetramethylpiperidide)2 in toluene T=20°C; 1 h; Microwave irradiation; 2: tert-butyl 4-(benzoyloxy)piperazine-1-carboxylate With [2,2']bipyridinyl; copper dichloride in tetrahydrofuran; toluene T=20°C; 1 h; Microwave irradiation;