1.1: aq. NaOH / 70 °C 2.1: (1R,2S)-(-)-erythro-2-amino-1,2-diphenyl ethanol; aq. HCl 2.2: aq. NaOH; p-toluenesulfonic acid / benzene / Heating View Scheme

hydrogen; palladium on activated charcoal in ethyl acetate Ambient temperature;

1: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / chlorobenzene / 8 h / 120 °C / |Inert atmosphere 2: triethylamine / 96 h / |Reflux; |Inert atmosphere View Scheme