1: 87 percent / LiBH4 / dioxane / 100 °C 2: 78 percent / conc. H2SO4 / 2 h / Heating View Scheme

1: lithium borohydride / 1,4-dioxane / 6.5 h / 100 °C / |Inert atmosphere 2: sulfuric acid / 36 h / |Reflux 3: pyridinium chlorochromate; silica gel / dichloromethane / 20 °C View Scheme

1: lithium borohydride / 1,4-dioxane / 6.5 h / 100 °C / |Inert atmosphere 2: sulfuric acid / 36 h / |Reflux View Scheme

sodium tetrahydroborate; chloroformic acid ethyl ester; triethylamine Yield given. Multistep reaction;