1: phenyllithium With 3-butyl-1,1-diethyl-1,3-dihydrobenzo[c][1,2]oxasilole in tetrahydrofuran; anhydrous butyl ether T=-78 - 20°C; Inert atmosphere; 2: pyrrolidin-1-yl benzoate With copper(l) iodide; dpca in tetrahydrofuran; anhydrous butyl ether T=20°C; 2 h; Inert atmosphere;

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;