1: 83 percent / aq. HCl / tetrahydrofuran / 0.25 h / Ambient temperature 2: 2.6 g / ethyl acetate / 0.33 h / Heating View Scheme

anhydrous magnesium perchlorate; 1-PhCH2-3-N-[(1S,2R)-2-HOCH2C6H10]NHCO-1,4-dihydropyridine in acetonitrile T=20°C; Reduction; 6.5 h; Title compound not separated from byproducts;

With  N-bromosuccinmide; azobisisobutyronitrile in  tetrachloromethane 3 h;  Ambient temperature;   

With  hydrogenchloride in  tetrahydrofuran 0.25 h;  Ambient temperature;