1: 49 percent / N-methylpyrrolidinone, NaH / 1.5 h / 150 °C 2: 23 percent / N-bromosuccinimide, benzoyl peroxide / CCl4 / 14 h / Heating; Irradiation View Scheme

1-methyl-pyrrolidin-2-one; sodium hydride T=150°C; 1.5 h;

Multi-step reaction with 4 steps 1: nitric acid; sulfuric acid / dichloromethane / 0.83 h / 20 °C2: iron; acetic acid / 5 h / 70 °C3: pyridine / 1 h / |Reflux4: bis-trimethylsilyl ether; tetraphosphorus decasulfide; Lawesson's reagent / toluene / 5 h / 60 °C