hydrogenchloride in diethyl ether byproducts: LiCl, MeOH; 1 equiv of MeLi slowly adding to a soln. of the boronic ester at -78°C, stirring for 3 h at the same temp., 1 equiv of anhydrous HCl in Et2O adding, allowing to warm to room temp., stirring for 15 min; the content was detd. by (11)B NMR spectrum;

80°C, 3 h;

in toluene T=20°C; 1 h; Product distribution / selectivity;

bis(diethylboryl)amine

80°C, 3 h;