1: 25 percent / DDQ / dioxane / 10 h / Heating 2: 8 percent / H2 / Pd-C / ethyl acetate / 4 h / 735.5 Torr / Ambient temperature View Scheme

1.1: phosphorous pentoxide / chloroform / 4 h / 20 °C / Inert atmosphere 2.1: “IBX” / dimethyl sulfoxide / 72 h / 40 °C / Inert atmosphere 3.1: ammonia; lithium; tert-butyl alcohol / tetrahydrofuran / 0.08 h / -78 °C / Inert atmosphere 4.1: potassium tri-sec-butyl-borohydride / tetrahydrofuran / 2 h / -78 °C / Inert atmosphere 5.1: hydrogenchloride / methanol / 2 h / Reflux; Inert atmosphere 5.2: 8 h / Reflux; Inert atmosphere View Scheme