1.1: acetic acid; sodium nitrite / water / 1.5 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: dichloromethane / 20 °C / Inert atmosphere 3.1: dirhodium(II) tetrakis(perfluorobutyrate) / toluene / 15 h / 90 °C / Inert atmosphere; Molecular sieve 4.1: potassium hydroxide / water / 2 h / 90 °C / Inert atmosphere 5.1: N,N-dimethyl-formamide / 15 h / 60 °C / Inert atmosphere 6.1: sodium tetrahydroborate / methanol; water / Inert atmosphere View Scheme

1.1: acetic acid; sodium nitrite / water / 1.5 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: dichloromethane / 20 °C / Inert atmosphere 3.1: dirhodium(II) tetrakis(perfluorobutyrate) / toluene / 15 h / 90 °C / Inert atmosphere; Molecular sieve 4.1: sodium tetrahydroborate / methanol; water / 20 - 100 °C / Inert atmosphere View Scheme

1.1: acetic acid; sodium nitrite / water / 1.5 h / 0 °C / Inert atmosphere 1.2: 0 - 20 °C / Inert atmosphere 2.1: dichloromethane / Inert atmosphere; Reflux 3.1: ruthenium(III) chloride polyhydrate / isopropanol acetate / 15 h / 80 °C / Inert atmosphere 4.1: sodium tetrahydroborate / methanol; water / 20 - 100 °C / Inert atmosphere View Scheme