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1.1: titanium tetrachloride; triethylamine / dichloromethane / 20 °C / Cooling with ice; Inert atmosphere 1.2: 20 - 40 °C / Inert atmosphere 2.1: N-((4S,5S)-4-(4-nitrophenyl)-1,3-dioxan-5-yl)picolinamide; trichlorosilane / 1,2-dichloro-ethane / 40 h / -10 °C 3.1: ethanol; potassium carbonate / 20 °C 4.1: ammonium cerium (IV) nitrate; water / acetonitrile / 0 - 20 °C View Scheme

1.1: titanium tetrachloride; triethylamine / dichloromethane / 20 °C / Cooling with ice; Inert atmosphere 1.2: 20 - 40 °C / Inert atmosphere 2.1: N-((4S,5S)-4-(4-nitrophenyl)-1,3-dioxan-5-yl)picolinamide; trichlorosilane / 1,2-dichloro-ethane / 40 h / -10 °C 3.1: ethanol; potassium carbonate / 20 °C 4.1: ammonium cerium (IV) nitrate; water / acetonitrile / 0 - 20 °C 5.1: sodium hydrogencarbonate / tetrahydrofuran / 0 - 20 °C View Scheme