1.1: methanol / diethyl ether; toluene / 3 h / 0 - 20 °C / Inert atmosphere 2.1: lithium diisopropyl amide / diethyl ether / 1 h / -100 °C / Inert atmosphere 2.2: 1 h / -100 °C / Inert atmosphere 3.1: dimethylsulfide borane complex / hexane / 0 °C / Inert atmosphere 3.2: 1 h / Inert atmosphere; Reflux 4.1: triethylamine / dichloromethane / 2 h / Inert atmosphere 5.1: 1.5 h / 20 °C / Inert atmosphere 6.1: sodium hydroxide / dichloromethane; water / Inert atmosphere 7.1: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / 3 h / Inert atmosphere; Reflux View Scheme