T=145°C;

1: With potassium phosphate; 18-crown-6 ether; 1,3-phenylene-bis-(1H)-tetrazole; palladium diacetate in N,N-dimethyl-formamide T=95°C; Suzuki cross-coupling; 7 h; 2: With hydrogen; triethylamine; palladium on activated charcoal in methanol T=20°C; Title compound not separated from byproducts;

1: With potassium phosphate; 18-crown-6 ether; 1,3-phenylene-bis-(1H)-tetrazole; palladium diacetate in N,N-dimethyl-formamide T=95°C; Suzuki cross-coupling; 7 h; 2: With hydrogen; triethylamine; palladium on activated charcoal in methanol T=20°C; Title compound not separated from byproducts;