1: With triethylamine; bis[(1S,2R,3S,5S)-pinan-3-yl]chloroborane in dichloromethane T=-60 - 0°C; 2 h; Inert atmosphere; 2: With water; sodium hydroxide in dichloromethane pH=10; Inert atmosphere; 3: With hydrogenchloride in water pH=5; optical yield given as percent eeenantioselective reaction;