1.1: potassium carbonate / N,N-dimethyl-formamide / 42 h / 20 °C / Inert atmosphere 2.1: palladium 10 on activated carbon; hydrogen; acetic acid / 19 h / 70 °C 3.1: toluene-4-sulfonic acid / toluene / 13 h / Inert atmosphere; Reflux 4.1: pyridine; thionyl chloride / 0 - 20 °C / Inert atmosphere 5.1: platinum(IV) oxide; hydrogen / methanol / 20 h / 20 °C 6.1: hydrogenchloride / water / 1 h / 80 °C / Inert atmosphere 6.2: pH 9 7.1: acetic acid; zinc / 4 h / Inert atmosphere; Reflux View Scheme