1.1: di-isopropyl azodicarboxylate; triphenylphosphine / tetrahydrofuran / 0.17 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: potassium carbonate / 2 h / 20 °C / Inert atmosphere 3.1: 4-(N,N-dimethlyamino)pyridine; N-ethyl-N,N-diisopropylamine / dichloromethane / 0.25 h / 0 °C / Inert atmosphere 3.2: 0 - 20 °C / Inert atmosphere 4.1: sodium hydroxide / tetrahydrofuran; methanol / 3 h / 20 °C / Inert atmosphere 4.2: 0 °C / Inert atmosphere 5.1: 4-(N,N-dimethlyamino)pyridine; camphor-10-sulfonic acid; dicyclohexyl-carbodiimide / dichloromethane / 3 h / 20 °C / Inert atmosphere 6.1: methanol; pyridinium p-toluenesulfonate / 6 h / 20 °C / Inert atmosphere 7.1: 4-(N,N-dimethlyamino)pyridine; camphor-10-sulfonic acid; dicyclohexyl-carbodiimide / dichloromethane / 12 h / 20 °C / Inert atmosphere 8.1: methanol; pyridinium p-toluenesulfonate / 24 h / 20 °C / Inert atmosphere 9.1: morpholine; tetrakis(triphenylphosphine) palladium(0) / tetrahydrofuran / 12 h / 20 °C / Inert atmosphere 9.2: Inert atmosphere 10.1: 2,4,6-trichlorobenzoyl chloride; triethylamine / toluene / 1 h / 20 °C / Inert atmosphere 10.2: 7 h / 80 °C 11.1: trifluoroacetic acid / dichloromethane / 5 h / 20 °C / Inert atmosphere View Scheme