1.1: hydrogen; palladium 10 on activated carbon / methanol / 16 h / 7500.75 Torr 2.1: triethylamine / 48 h / 75 °C 3.1: water; acetic acid; sodium nitrite / 20 h / 25 °C 4.1: O-(6-chloro-1H-benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 0.25 h / 25 °C / |Inert atmosphere 4.2: 16 h / 25 °C / |Inert atmosphere View Scheme