1: K2[OsO2(OH)4]; 1,4-bis(dihydroquininyl)anthraquinone / propan-1-ol; H2O / 20 °C 2: Ti(OiPr)4 / 20 °C 3: H2 / Pd/C / methanol 4: 85 percent / TsOH / 1,2-dimethoxy-ethane / 4 h 5: 85 percent / LHMDS / tetrahydrofuran / -78 °C 6: dicyclohexylcarbodiimide; DMSO; CF3COOH / pyridine 7: 60 percent / TiCl4 / -78 - 35 °C 8: O3; Me2S 9: NaClO2; NaH2PO4 10: HCOONH4 / Pd black 11: NaOH; H2O 12: bis(2-oxo-3-oxazolidinyl)phosphonic chloride View Scheme

1: K2[OsO2(OH)4]; 1,4-bis(dihydroquininyl)anthraquinone / propan-1-ol; H2O / 20 °C 2: Ti(OiPr)4 / 20 °C 3: H2 / Pd/C / methanol 4: 85 percent / TsOH / 1,2-dimethoxy-ethane / 4 h 5: 85 percent / LHMDS / tetrahydrofuran / -78 °C 6: dicyclohexylcarbodiimide; DMSO; CF3COOH / pyridine 7: 60 percent / TiCl4 / -78 - 35 °C 8: O3; Me2S 9: NaClO2; NaH2PO4 10: HCOONH4 / Pd black 11: NaOH; H2O View Scheme