1.1: 31 percent / (AcO)(H2O)(S,S)N,N'bis(3,5-di-t-Bu-Sal-1,2-cC6H11diNH2)CoIII / H2O / 16 h 2.1: CuI / tetrahydrofuran / 2 h / -10 - 0 °C 3.1: PPTS / CH2Cl2 4.1: O3 / CH2Cl2 / -78 °C 4.2: Me2S / CH2Cl2 / 1 h / -78 - 20 °C 5.1: tetrahydrofuran / 2 h / -78 °C 6.1: amberlite IR-120 / methanol View Scheme

1.1: m-CPBA / CH2Cl2 2.1: 31 percent / (AcO)(H2O)(S,S)N,N'bis(3,5-di-t-Bu-Sal-1,2-cC6H11diNH2)CoIII / H2O / 16 h 3.1: CuI / tetrahydrofuran / 2 h / -10 - 0 °C 4.1: PPTS / CH2Cl2 5.1: O3 / CH2Cl2 / -78 °C 5.2: Me2S / CH2Cl2 / 1 h / -78 - 20 °C 6.1: tetrahydrofuran / 2 h / -78 °C 7.1: amberlite IR-120 / methanol View Scheme

1.1: PPTS / CH2Cl2 2.1: O3 / CH2Cl2 / -78 °C 2.2: Me2S / CH2Cl2 / 1 h / -78 - 20 °C 3.1: tetrahydrofuran / 2 h / -78 °C 4.1: amberlite IR-120 / methanol View Scheme

1.1: O3 / CH2Cl2 / -78 °C 1.2: Me2S / CH2Cl2 / 1 h / -78 - 20 °C 2.1: tetrahydrofuran / 2 h / -78 °C 3.1: amberlite IR-120 / methanol View Scheme

View Scheme

Multistep reaction;