1.1: zinc; hydrogenchloride / water / 1.5 h / 95 °C 2.1: O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine / dichloromethane / 0.17 h / 20 °C / |Inert atmosphere 2.2: 16 h / 20 °C / |Inert atmosphere View Scheme

hydroxylamine hydrochloride in dichloromethane T=20°C;

hydrogenchloride; zinc in water T=95°C; 1.5 h;