1.1: 1,8-diazabicyclo[5.4.0]undec-7-ene; 2-hydroxyethanethiol / acetone / 3 h / 20 °C 2.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 6 h / 0 °C 3.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 3.2: 1 h 4.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 5.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 5.2: 0.5 h / -78 °C / Inert atmosphere 5.3: 0.5 h 6.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 7.1: triphenylphosphine / toluene / 3 h / Reflux 8.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 9.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 10.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 10.2: 4 °C View Scheme

1.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 6 h / 0 °C 2.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 2.2: 1 h 3.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 4.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 4.2: 0.5 h / -78 °C / Inert atmosphere 4.3: 0.5 h 5.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 6.1: triphenylphosphine / toluene / 3 h / Reflux 7.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 8.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 9.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 9.2: 4 °C View Scheme

1.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 1.2: 1 h 2.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 3.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 3.2: 0.5 h / -78 °C / Inert atmosphere 3.3: 0.5 h 4.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 5.1: triphenylphosphine / toluene / 3 h / Reflux 6.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 7.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 8.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 8.2: 4 °C View Scheme

1.1: sodium hydrogencarbonate / water 1.2: 20 °C / Darkness 2.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 6 h / Reflux 3.1: potassium carbonate / 5 h / 20 °C 4.1: triphenylphosphine; diethylazodicarboxylate / toluene / 6 h / -20 °C / Inert atmosphere 5.1: 1,8-diazabicyclo[5.4.0]undec-7-ene; 2-hydroxyethanethiol / acetone / 3 h / 20 °C 6.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 6 h / 0 °C 7.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 7.2: 1 h 8.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 9.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 9.2: 0.5 h / -78 °C / Inert atmosphere 9.3: 0.5 h 10.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 11.1: triphenylphosphine / toluene / 3 h / Reflux 12.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 13.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 14.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 14.2: 4 °C View Scheme

1.1: potassium carbonate / 5 h / 20 °C 2.1: triphenylphosphine; diethylazodicarboxylate / toluene / 6 h / -20 °C / Inert atmosphere 3.1: 1,8-diazabicyclo[5.4.0]undec-7-ene; 2-hydroxyethanethiol / acetone / 3 h / 20 °C 4.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 6 h / 0 °C 5.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 5.2: 1 h 6.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 7.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 7.2: 0.5 h / -78 °C / Inert atmosphere 7.3: 0.5 h 8.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 9.1: triphenylphosphine / toluene / 3 h / Reflux 10.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 11.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 12.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 12.2: 4 °C View Scheme

1.1: lithium hydroxide hydrate / tetrahydrofuran; water / 26 h / 20 °C 1.2: pH 2 / Acidic aq. solution 2.1: sodium hydrogencarbonate / water 2.2: 20 °C / Darkness 3.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / toluene / 6 h / Reflux 4.1: potassium carbonate / 5 h / 20 °C 5.1: triphenylphosphine; diethylazodicarboxylate / toluene / 6 h / -20 °C / Inert atmosphere 6.1: 1,8-diazabicyclo[5.4.0]undec-7-ene; 2-hydroxyethanethiol / acetone / 3 h / 20 °C 7.1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 6 h / 0 °C 8.1: titanium(IV) isopropylate; trimethylsilylazide / benzene / 2 h / 5 - 20 °C / Inert atmosphere 8.2: 1 h 9.1: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 10.1: lithium diisopropyl amide / tetrahydrofuran; hexane / 0.75 h / -78 °C / Inert atmosphere 10.2: 0.5 h / -78 °C / Inert atmosphere 10.3: 0.5 h 11.1: pyridine; dihydrogen peroxide / dichloromethane / 0.5 h / 20 °C 12.1: triphenylphosphine / toluene / 3 h / Reflux 13.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0 - 20 °C 14.1: boron trifluoride diethyl etherate / 3 h / -20 °C / Inert atmosphere 15.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 15.2: 4 °C View Scheme

1.1: hydrogen azide; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; benzene / 10 - 20 °C 2.1: hydrogen / ethanol 2.2: 50 °C View Scheme

1.1: orthoformic acid triethyl ester 2.1: 4-(N,N-dimethlyamino)pyridine; N-ethyl-N,N-diisopropylamine / dichloromethane / 0 - 40 °C 3.1: triethylsilane; titanium tetrachloride / dichloromethane / -78 - -10 °C 4.1: hydrogen azide; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; benzene / 10 - 20 °C 5.1: 2,6-dimethylpyridine / chloroform / 6 h / 20 - 55 °C 6.1: zirconium tetrachloride; isopropyl alcohol / 4 h / 50 °C 7.1: hydrogen azide; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; benzene / 10 - 20 °C 8.1: hydrogen / ethanol 8.2: 50 °C View Scheme

1.1: benzenesulfonic Acid 2.1: orthoformic acid triethyl ester 3.1: 4-(N,N-dimethlyamino)pyridine; N-ethyl-N,N-diisopropylamine / dichloromethane / 0 - 40 °C 4.1: triethylsilane; titanium tetrachloride / dichloromethane / -78 - -10 °C 5.1: hydrogen azide; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; benzene / 10 - 20 °C 6.1: 2,6-dimethylpyridine / chloroform / 6 h / 20 - 55 °C 7.1: zirconium tetrachloride; isopropyl alcohol / 4 h / 50 °C 8.1: triethylamine 9.1: sodium azide 10.1: hydrogen / ethanol 10.2: 50 °C View Scheme

1.1: copper(II) bis(trifluoromethanesulfonate); borane-THF / 0.17 h / 20 °C / |Inert atmosphere 2.1: 1H-imidazole; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 24 h / 20 °C / |Inert atmosphere 3.1: pyridine / dichloromethane / 1 h / -15 °C / |Inert atmosphere 4.1: sodium azide / N,N-dimethyl-formamide / 2 h / 20 °C 5.1: triphenylphosphine / tetrahydrofuran / 4 h / 20 °C 5.2: 4 h / 20 °C 6.1: pyridine / 2 h / 0 - 20 °C 7.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 4 h / 20 °C / |Inert atmosphere 8.1: dimethyl sulfoxide; oxalyl dichloride / dichloromethane / 1 h / -78 °C / |Inert atmosphere 8.2: 0.75 h / -78 - 20 °C / |Inert atmosphere 9.1: titanium tetrachloride / dichloromethane / 0.25 h / 0 °C / |Inert atmosphere 9.2: 2 h / 0 °C / |Inert atmosphere 10.1: 10 Pd/C; hydrogen / ethanol / 96 h / 20 °C 11.1: sodium hydride / tetrahydrofuran / 1 h / 0 °C / |Inert atmosphere 12.1: triethylamine / dichloromethane / 0.75 h / 0 °C 13.1: sodium azide / ethanol; water / 8 h / |Reflux 14.1: triphenylphosphine / tetrahydrofuran / 4 h / 20 °C 14.2: Staudinger Azide Reduction / 24 h / 20 °C 15.1: phosphoric acid / ethanol / 0 - 50 °C View Scheme