1: 55 percent / NaH (80percent in paraffine oil) / tetrahydrofuran / 12 h / Heating 2: 94 percent / H2, Pd/C (10percent) / ethanol / 4 h / Ambient temperature 3: 1) NaH (80percent in paraffine oil) / 1) 30 min, r. t., THF, 2) 6h, reflux, THF View Scheme

1: 94 percent / H2, Pd/C (10percent) / ethanol / 4 h / Ambient temperature 2: 1) NaH (80percent in paraffine oil) / 1) 30 min, r. t., THF, 2) 6h, reflux, THF View Scheme

sodium hydride 1) 30 min, r. t., THF, 2) 6h, reflux, THF; Yield given;