反应条件
1.1: potassium carbonate / N,N-dimethyl-formamide / 20 h / 110 °C 2.1: acetic acid / N,N-dimethyl-formamide / 80 °C 2.2: 80 °C 2.3: 1.5 h / 5 °C / pH 9 3.1: palladium diacetate; silver carbonate; p-benozquinone / 1,2-dichloro-ethane / 12 h / 130 °C 4.1: n-butyllithium / tetrahydrofuran; hexane / 0.17 h / -78 °C / Inert atmosphere 4.2: Inert atmosphere View Scheme
