1.1: sodium hydroxide / tetrahydrofuran; water / 20 °C 1.2: pH 2 - 3 2.1: triethylamine / dichloromethane / 2 h / 0 °C / Inert atmosphere 3.1: potassium hydroxide / diethyl ether; diethylene glycol monoethyl ether; water / 0.5 h / Heating 3.2: 20 °C / Cooling with ice 4.1: silver benzoate; triethylamine / 0 °C / Inert atmosphere; Darkness 5.1: lithium borohydride / tetrahydrofuran / 3 h / 50 °C / Inert atmosphere 5.2: pH 2 - 3 View Scheme

1.1: silver benzoate; triethylamine / 0 °C / Inert atmosphere; Darkness 2.1: lithium borohydride / tetrahydrofuran / 3 h / 50 °C / Inert atmosphere 2.2: pH 2 - 3 View Scheme