1: With boron tribromide in dichloromethane T=-78 - 20°C; 18.33 h; 2: With water; sodium hydrogencarbonate in dichloromethane pH=8;

1: phenyl-magnesium bromide With titanium tetraethoxide in tetrahydrofuran T=20°C; 0.5 h; Inert atmosphere; 2: 3-hydroxy-5-bromopyridine With tributylphosphine; cobalt(II) chloride in tetrahydrofuran T=20°C; Inert atmosphere; chemoselective reaction;