1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 2: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 3: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 4: trifluoroacetic acid / methanol / 24 h / 50 °C 5: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 2: triethylamine / methanol / 0 - 20 °C 3: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 4: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 5: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 6: trifluoroacetic acid / methanol / 24 h / 50 °C 7: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1.1: potassium carbonate / acetone / 0 - 20 °C / Inert atmosphere 2.1: trichlorophosphate / 0.33 h / 20 °C 2.2: 6 h / 60 °C 3.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 4.1: triethylamine / methanol / 0 - 20 °C 5.1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 6.1: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 7.1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 8.1: trifluoroacetic acid / methanol / 24 h / 50 °C 9.1: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 2: trifluoroacetic acid / methanol / 24 h / 50 °C 3: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1.1: triethylamine / methanol / 0 - 20 °C 2.1: potassium carbonate / acetone / 0 - 20 °C / Inert atmosphere 3.1: trichlorophosphate / 0.33 h / 20 °C 3.2: 6 h / 60 °C 4.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 5.1: triethylamine / methanol / 0 - 20 °C 6.1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 7.1: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 8.1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 9.1: trifluoroacetic acid / methanol / 24 h / 50 °C 10.1: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: triethylamine / methanol / 0 - 20 °C 2: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 3: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 4: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 5: trifluoroacetic acid / methanol / 24 h / 50 °C 6: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: potassium carbonate / acetone / 9.5 h / 20 °C / Inert atmosphere 2: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 3: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 4: trifluoroacetic acid / methanol / 24 h / 50 °C 5: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: potassium carbonate / methanol / 3 h / 20 °C / Inert atmosphere 2: potassium carbonate / acetone / 9.5 h / 20 °C / Inert atmosphere 3: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 4: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 5: trifluoroacetic acid / methanol / 24 h / 50 °C 6: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1: thionyl chloride / dichloromethane; N,N-dimethyl-formamide / 1.5 h / 0 °C / Inert atmosphere 2: triethylamine / dichloromethane / 0.5 h / 0 °C / Inert atmosphere 3: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 4: trifluoroacetic acid / methanol / 24 h / 50 °C 5: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme

1.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 1.5 h / 50 °C 2.1: triethylamine / methanol / 0 - 20 °C 3.1: potassium carbonate / acetone / 0 - 20 °C / Inert atmosphere 4.1: trichlorophosphate / 0.33 h / 20 °C 4.2: 6 h / 60 °C 5.1: selenium(IV) oxide; dihydrogen peroxide / tert-butyl alcohol / 2.5 h / 50 °C 6.1: triethylamine / methanol / 0 - 20 °C 7.1: potassium carbonate / acetone / 36 h / 20 °C / Inert atmosphere 8.1: AlCl3, aluminium chloride / dichloromethane / 0 - 20 °C 9.1: lithium hexamethyldisilazane / tetrahydrofuran / -30 - 0 °C / Inert atmosphere 10.1: trifluoroacetic acid / methanol / 24 h / 50 °C 11.1: AlCl3, aluminium chloride; ethanethiol / CHCl2 / 0 - 20 °C View Scheme