dilithium tetrachlorocuprate in tetrahydrofuran T=-10°C; 3 h;

1: 1.) lithium, ammonia, 2.) dimethylsulfoxide / 2.) THF, a) 2 h, b) 4 h 2: 100 percent / LiAlH4 / tetrahydrofuran / 3 h / Heating 3: 76 percent / H2 / Pd/C / ethanol 4: pyridinium dichromate (PDC), molecular sieves 3A / CH2Cl2 / 2 h / Ambient temperature View Scheme