1: With Pd(1,2-bis(diphenylphosphino)ethane)Cl2; lithium triethylborohydride in tetrahydrofuran; 1,4-dioxane T=70°C; 8 h; Inert atmosphere; 2: With methanol; toluene-4-sulfonic acid T=20°C; 2 h; Inert atmosphere;

1: With Pd(1,2-bis(diphenylphosphino)ethane)Cl2; lithium triethylborohydride in tetrahydrofuran; 1,4-dioxane T=70°C; 8 h; Inert atmosphere; 2: With methanol; toluene-4-sulfonic acid T=20°C; 2 h; Inert atmosphere;