ammonium acetate; hydrogenchloride; sodium cyanoborohydride in methanol 2.5 h; Ambient temperature;

sodium tetrahydroborate; n-butyllithium; acetic acid 1.) THF, hexane, -78 deg C, 1 h, 2.) -78 deg C to -5 deg C, 1 h, 3.) room temperature, 15 h; Yield given. Multistep reaction;