hydrogenchloride in diethyl ether byproducts: LiCl, 2-propanol; 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;

(i) (irradiation), tBuOCl, (ii) /BRN= 969148/; Multistep reaction;