1: With n-butyllithium; tri-isopropoxy-borane in tetrahydrofuran; hexanes; toluene T=-40 - 20°C; 1 h; 2: With hydrogenchloride in tetrahydrofuran; hexanes; water; toluene T=20°C; 3: With sodium hydroxide in tetrahydrofuran; hexanes; water; ethyl acetate; toluene pH=7;