1: 75 percent / triethylamine, DCC / CHCl3 / 0.25 h / 0 °C 2: 100 percent / hydrogen / 10percent palladium on carbon / methanol / 2 h / 760 Torr 3: 29 percent / 3,5-di-tert-butyl-1,2-benzoquinone / methanol / 18 h / 40 °C 4: 36 percent / CAN, pyridine-2,6-dicarboxylic acid N-oxide / H2O; acetonitrile / 0.5 h View Scheme