oxygen; lithium chloride; manganese (II) chloride in tetrahydrofuran T=-20°C; 1 h; Inert atmosphere; chemoselective reaction;

1: 4-methoxyphenyl magnesium bromide in tetrahydrofuran T=-20°C; 0.166667 h; 2: ethyl 5-bromo-2-furancarboxylate With N,N'-dimethyl-N,N'-propyleneurea; para-fluorostyrene; tetra-(n-butyl)ammonium iodide; cobalt(II) 2,4-pentanedionate in tetrahydrofuran; ethylene glycol dimethyl ether T=80°C; 8 h; Further stages.;

palladium diacetate; caesium carbonate; triphenylphosphine in 1-methyl-pyrrolidin-2-one T=90°C; 1 h;