1: With n-butylzinc chloride; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 2 h; Heating; 2: With sodium hydroxide in tetrahydrofuran; methanol T=20°C; 15 h; Title compound not separated from byproducts;

1: With formic acid; triethylamine; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=20°C; 7 h; 2: With sodium hydroxide in tetrahydrofuran; methanol T=20°C; 15 h; Title compound not separated from byproducts;

formic acid; triethylamine; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran T=20°C; 7 h; Title compound not separated from byproducts;

n-butylzinc chloride; tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran 2 h; Heating; Title compound not separated from byproducts;