methanesulfonyl chloride; triethylamine in dichloromethane T=-20°C; 1 h; Inert atmosphere;

1.1: 2,6-dimethylpyridine; sodium periodate; water / osmium(VIII) oxide / tert-butyl alcohol; tetrahydrofuran / 5 h / 40 °C / Inert atmosphere 1.2: 18 h / 23 °C / Inert atmosphere 2.1: triethylamine; methanesulfonyl chloride / dichloromethane / 1 h / -20 °C / Inert atmosphere View Scheme