1: 4-iodo-1-triphenylmethyl-1H-imidazole With ethylmagnesium bromide in tetrahydrofuran T=20°C; Negishi coupling reaction; 0.166667 h; Inert atmosphere; 2: With zinc(II) chloride in tetrahydrofuran Negishi coupling reaction; 2 h; Inert atmosphere; 3: 2',3',5'-tri-O-TBS-7-iodotubercidin With tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=90°C; Negishi coupling reaction; 16 h; Inert atmosphere;