1: With methanol; triethylamine in dichloromethane T=20°C; 4 h; 2: With sodium tris(acetoxy)borohydride in dichloromethane T=20°C; 3: With sodium hydrogencarbonate in dichloromethane; water

sodium cyanoborohydride; acetic acid in dichloromethane T=20°C; 16 h; Inert atmosphere;