1: 55 percent / tetrabutylammonium nitrate (TBAN); trifluoroacetic anhydride (TFAA) / CH2Cl2 / 0 °C 2: 10 percent / KCN / methanol 3: 80 percent / H2 / Raney Ni View Scheme

1: 55 percent / TBAN; TFAA / CH2Cl2 / 0 °C 2: 62 percent / KCN / 48 h / 20 °C View Scheme

in methanol Heating;