1.1: titanium tetrachloride / dichloromethane / 0.08 h / -78 °C / |Inert atmosphere 1.2: 1 h / -78 °C / |Inert atmosphere 1.3: 3 h / -78 - 20 °C / |Inert atmosphere 2.1: 2,6-dimethylpyridine / dichloromethane / 0 - 20 °C / |Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.17 h / 20 °C / |Inert atmosphere 4.1: 2,4,6-trichlorobenzoyl chloride; triethylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 4.2: 20 °C / |Inert atmosphere 5.1: trifluoroacetic acid / dichloromethane / 0.75 h / 0 °C / |Inert atmosphere 6.1: 3-chloro-benzenecarboperoxoic acid / chloroform / 4 h / -20 °C View Scheme

1.1: titanium tetrachloride / dichloromethane / 0.08 h / -78 °C / |Inert atmosphere 1.2: 1 h / -78 °C / |Inert atmosphere 1.3: 3 h / -78 - 20 °C / |Inert atmosphere 2.1: 2,6-dimethylpyridine / dichloromethane / 0 - 20 °C / |Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.17 h / 20 °C / |Inert atmosphere 4.1: 2,4,6-trichlorobenzoyl chloride; triethylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 4.2: 20 °C / |Inert atmosphere 5.1: trifluoroacetic acid / dichloromethane / 0.75 h / 0 °C / |Inert atmosphere View Scheme