1.1: lithium diisopropyl amide / diethyl ether / 1 h / -100 °C / Inert atmosphere 1.2: 1 h / -100 °C / Inert atmosphere 2.1: dimethylsulfide borane complex / hexane / 0 °C / Inert atmosphere 2.2: 1 h / Inert atmosphere; Reflux 3.1: triethylamine / dichloromethane / 2 h / Inert atmosphere 4.1: 1.5 h / 20 °C / Inert atmosphere 5.1: sodium hydroxide / dichloromethane; water / Inert atmosphere 6.1: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / 3 h / Inert atmosphere; Reflux View Scheme

lithium aluminium tetrahydride in diethyl ether T=0°C; Reduction; 0.5 h;