Multi-step reaction with 2 steps 1: 1) NaH, 2) conc. H2SO4 / 1) ether, EtOH, 20 h, RT, 2) EtOH, 2 h, reflux2: 66 percent / DDQ / dioxane / 5 h / Heating  

Multi-step reaction with 2 steps 1.1: lithium diisopropyl amide / tetrahydrofuran / 1 h / -78 - -25 °C / |Inert atmosphere1.2: 3.33 h / -78 - 0 °C / |Inert atmosphere2.1: indium(III) chloride / toluene / 5 h / |Inert atmosphere; |Reflux