1.1: cerium(III) chloride heptahydrate; sodium tetrahydroborate; methanol / dichloromethane / 1.33 h / 0 - 10 °C / |Inert atmosphere 2.1: sodium hydride / dimethyl sulfoxide / 1.5 h / 80 °C / |Inert atmosphere 2.2: 3 h / 80 °C / |Inert atmosphere 3.1: SIBX / acetone / 3 h / 56 °C / |Inert atmosphere 4.1: toluene-4-sulfonic acid; water / acetone / 3 h / 25 - 35 °C / |Inert atmosphere View Scheme